diff --git a/RpgRoller/frontend/app.ts b/RpgRoller/frontend/app.ts
index a1e30da..ba23372 100644
--- a/RpgRoller/frontend/app.ts
+++ b/RpgRoller/frontend/app.ts
@@ -61,6 +61,8 @@ const rollVisibilitySelect = mustSelect("roll-visibility");
 
 type AppState = {
     user: UserSummary | null;
+    activeCharacterId: string | null;
+    selectedCharacterId: string | null;
     campaigns: CampaignSummary[];
     selectedCampaignId: string | null;
     selectedCampaign: CampaignDetails | null;
@@ -71,6 +73,8 @@ type AppState = {
 
 const state: AppState = {
     user: null,
+    activeCharacterId: null,
+    selectedCharacterId: null,
     campaigns: [],
     selectedCampaignId: null,
     selectedCampaign: null,
@@ -138,11 +142,21 @@ campaignSelect.addEventListener("change", async () => {
         const selected = campaignSelect.value;
         state.selectedCampaignId = selected.length > 0 ? selected : null;
         await reloadSelectedCampaign();
+        syncSelectedCharacter();
+        renderCharacterSelect();
+        renderSkillSelect();
         connectStateEvents();
-        renderAll();
+        renderCampaignMeta();
+        renderCampaignDetails();
+        renderCampaignLog();
     });
 });
 
+characterSelect.addEventListener("change", () => {
+    state.selectedCharacterId = characterSelect.value.length > 0 ? characterSelect.value : null;
+    renderSkillSelect();
+});
+
 refreshCampaignButton.addEventListener("click", async () => {
     await runAction(async () => {
         await reloadSelectedCampaign();
@@ -179,6 +193,8 @@ activateCharacterButton.addEventListener("click", async () => {
         }
 
         await activateCharacter(characterId);
+        state.activeCharacterId = characterId;
+        state.selectedCharacterId = characterId;
         await reloadAll();
         setMessage("Active character updated.", false);
     });
@@ -270,10 +286,12 @@ async function reloadSession(): Promise<void> {
     try {
         const me = await getMe();
         state.user = me.user;
+        state.activeCharacterId = me.activeCharacterId ?? null;
         state.selectedCampaignId = me.currentCampaignId ?? state.selectedCampaignId;
     }
     catch {
         state.user = null;
+        state.activeCharacterId = null;
     }
 }
 
@@ -317,6 +335,7 @@ async function reloadSelectedCampaign(): Promise<void> {
     }
 
     state.selectedCampaign = await getCampaign(state.selectedCampaignId);
+    syncSelectedCharacter();
 }
 
 async function reloadCampaignLog(): Promise<void> {
@@ -368,6 +387,8 @@ function resetStateAfterLogout(): void {
 }
 
 function resetAuthenticatedState(): void {
+    state.activeCharacterId = null;
+    state.selectedCharacterId = null;
     state.campaigns = [];
     state.selectedCampaignId = null;
     state.selectedCampaign = null;
@@ -404,7 +425,9 @@ function renderCampaignMeta(): void {
     }
 
     const isGm = state.selectedCampaign.gm.id === state.user.id;
-    campaignMetaElement.textContent = `Selected: ${state.selectedCampaign.name} (${state.selectedCampaign.rulesetId}) - ${isGm ? "You are GM" : "Player context"}`;
+    const activeCharacter = state.selectedCampaign.characters.find((character) => character.id === state.activeCharacterId);
+    const activeLabel = activeCharacter ? ` | Active: ${activeCharacter.name}` : "";
+    campaignMetaElement.textContent = `Selected: ${state.selectedCampaign.name} (${state.selectedCampaign.rulesetId}) - ${isGm ? "You are GM" : "Player context"}${activeLabel}`;
 }
 
 function renderCampaignDetails(): void {
@@ -433,14 +456,21 @@ function renderCampaignDetails(): void {
 function renderCharacterSelect(): void {
     if (!state.selectedCampaign) {
         characterSelect.innerHTML = "";
+        state.selectedCharacterId = null;
         return;
     }
 
+    const selectedCharacterId = resolveSelectedCharacterId();
+
     const options = state.selectedCampaign.characters
-        .map((character) => `<option value="${character.id}">${character.name}</option>`)
+        .map((character) => {
+            const selected = character.id === selectedCharacterId ? " selected" : "";
+            return `<option value="${character.id}"${selected}>${character.name}</option>`;
+        })
         .join("");
 
     characterSelect.innerHTML = options;
+    state.selectedCharacterId = selectedCharacterId;
 }
 
 function renderSkillSelect(): void {
@@ -449,7 +479,9 @@ function renderSkillSelect(): void {
         return;
     }
 
-    const options = state.selectedCampaign.skills
+    const selectedCharacterId = resolveSelectedCharacterId();
+    const characterSkills = state.selectedCampaign.skills.filter((skill) => skill.characterId === selectedCharacterId);
+    const options = characterSkills
         .map((skill) => `<option value="${skill.id}">${skill.name} (${skill.diceRollDefinition})</option>`)
         .join("");
 
@@ -467,8 +499,11 @@ function selectedSkillFromCampaign(): SkillSummary | null {
         return null;
     }
 
+    const selectedCharacterId = resolveSelectedCharacterId();
     const selectedSkillId = skillSelect.value;
-    return state.selectedCampaign.skills.find((skill) => skill.id === selectedSkillId) ?? null;
+    return state.selectedCampaign.skills
+        .filter((skill) => skill.characterId === selectedCharacterId)
+        .find((skill) => skill.id === selectedSkillId) ?? null;
 }
 
 function renderCampaignLog(): void {
@@ -554,3 +589,33 @@ function mustButton(id: string): HTMLButtonElement {
 
     return element;
 }
+
+function syncSelectedCharacter(): void {
+    if (!state.selectedCampaign) {
+        state.selectedCharacterId = null;
+        return;
+    }
+
+    const availableIds = new Set(state.selectedCampaign.characters.map((character) => character.id));
+    if (state.selectedCharacterId && availableIds.has(state.selectedCharacterId)) {
+        return;
+    }
+
+    if (state.activeCharacterId && availableIds.has(state.activeCharacterId)) {
+        state.selectedCharacterId = state.activeCharacterId;
+        return;
+    }
+
+    state.selectedCharacterId = state.selectedCampaign.characters.length > 0
+        ? state.selectedCampaign.characters[0].id
+        : null;
+}
+
+function resolveSelectedCharacterId(): string | null {
+    if (!state.selectedCampaign) {
+        return null;
+    }
+
+    syncSelectedCharacter();
+    return state.selectedCharacterId;
+}
diff --git a/RpgRoller/wwwroot/app.js b/RpgRoller/wwwroot/app.js
index ebd04c4..8440021 100644
--- a/RpgRoller/wwwroot/app.js
+++ b/RpgRoller/wwwroot/app.js
@@ -31,6 +31,8 @@ const rollForm = mustForm("roll-form");
 const rollVisibilitySelect = mustSelect("roll-visibility");
 const state = {
     user: null,
+    activeCharacterId: null,
+    selectedCharacterId: null,
     campaigns: [],
     selectedCampaignId: null,
     selectedCampaign: null,
@@ -87,10 +89,19 @@ campaignSelect.addEventListener("change", async () => {
         const selected = campaignSelect.value;
         state.selectedCampaignId = selected.length > 0 ? selected : null;
         await reloadSelectedCampaign();
+        syncSelectedCharacter();
+        renderCharacterSelect();
+        renderSkillSelect();
         connectStateEvents();
-        renderAll();
+        renderCampaignMeta();
+        renderCampaignDetails();
+        renderCampaignLog();
     });
 });
+characterSelect.addEventListener("change", () => {
+    state.selectedCharacterId = characterSelect.value.length > 0 ? characterSelect.value : null;
+    renderSkillSelect();
+});
 refreshCampaignButton.addEventListener("click", async () => {
     await runAction(async () => {
         await reloadSelectedCampaign();
@@ -121,6 +132,8 @@ activateCharacterButton.addEventListener("click", async () => {
             throw new Error("Select a character to activate.");
         }
         await activateCharacter(characterId);
+        state.activeCharacterId = characterId;
+        state.selectedCharacterId = characterId;
         await reloadAll();
         setMessage("Active character updated.", false);
     });
@@ -196,10 +209,12 @@ async function reloadSession() {
     try {
         const me = await getMe();
         state.user = me.user;
+        state.activeCharacterId = me.activeCharacterId ?? null;
         state.selectedCampaignId = me.currentCampaignId ?? state.selectedCampaignId;
     }
     catch {
         state.user = null;
+        state.activeCharacterId = null;
     }
 }
 async function ensureRulesets() {
@@ -233,6 +248,7 @@ async function reloadSelectedCampaign() {
         return;
     }
     state.selectedCampaign = await getCampaign(state.selectedCampaignId);
+    syncSelectedCharacter();
 }
 async function reloadCampaignLog() {
     if (!state.selectedCampaignId) {
@@ -274,6 +290,8 @@ function resetStateAfterLogout() {
     closeStateEvents();
 }
 function resetAuthenticatedState() {
+    state.activeCharacterId = null;
+    state.selectedCharacterId = null;
     state.campaigns = [];
     state.selectedCampaignId = null;
     state.selectedCampaign = null;
@@ -305,7 +323,9 @@ function renderCampaignMeta() {
         return;
     }
     const isGm = state.selectedCampaign.gm.id === state.user.id;
-    campaignMetaElement.textContent = `Selected: ${state.selectedCampaign.name} (${state.selectedCampaign.rulesetId}) - ${isGm ? "You are GM" : "Player context"}`;
+    const activeCharacter = state.selectedCampaign.characters.find((character) => character.id === state.activeCharacterId);
+    const activeLabel = activeCharacter ? ` | Active: ${activeCharacter.name}` : "";
+    campaignMetaElement.textContent = `Selected: ${state.selectedCampaign.name} (${state.selectedCampaign.rulesetId}) - ${isGm ? "You are GM" : "Player context"}${activeLabel}`;
 }
 function renderCampaignDetails() {
     if (!state.selectedCampaign) {
@@ -329,19 +349,27 @@ function renderCampaignDetails() {
 function renderCharacterSelect() {
     if (!state.selectedCampaign) {
         characterSelect.innerHTML = "";
+        state.selectedCharacterId = null;
         return;
     }
+    const selectedCharacterId = resolveSelectedCharacterId();
     const options = state.selectedCampaign.characters
-        .map((character) => `<option value="${character.id}">${character.name}</option>`)
+        .map((character) => {
+        const selected = character.id === selectedCharacterId ? " selected" : "";
+        return `<option value="${character.id}"${selected}>${character.name}</option>`;
+    })
         .join("");
     characterSelect.innerHTML = options;
+    state.selectedCharacterId = selectedCharacterId;
 }
 function renderSkillSelect() {
     if (!state.selectedCampaign) {
         skillSelect.innerHTML = "";
         return;
     }
-    const options = state.selectedCampaign.skills
+    const selectedCharacterId = resolveSelectedCharacterId();
+    const characterSkills = state.selectedCampaign.skills.filter((skill) => skill.characterId === selectedCharacterId);
+    const options = characterSkills
         .map((skill) => `<option value="${skill.id}">${skill.name} (${skill.diceRollDefinition})</option>`)
         .join("");
     skillSelect.innerHTML = options;
@@ -355,8 +383,11 @@ function selectedSkillFromCampaign() {
     if (!state.selectedCampaign) {
         return null;
     }
+    const selectedCharacterId = resolveSelectedCharacterId();
     const selectedSkillId = skillSelect.value;
-    return state.selectedCampaign.skills.find((skill) => skill.id === selectedSkillId) ?? null;
+    return state.selectedCampaign.skills
+        .filter((skill) => skill.characterId === selectedCharacterId)
+        .find((skill) => skill.id === selectedSkillId) ?? null;
 }
 function renderCampaignLog() {
     if (state.campaignLog.length === 0) {
@@ -426,3 +457,27 @@ function mustButton(id) {
     }
     return element;
 }
+function syncSelectedCharacter() {
+    if (!state.selectedCampaign) {
+        state.selectedCharacterId = null;
+        return;
+    }
+    const availableIds = new Set(state.selectedCampaign.characters.map((character) => character.id));
+    if (state.selectedCharacterId && availableIds.has(state.selectedCharacterId)) {
+        return;
+    }
+    if (state.activeCharacterId && availableIds.has(state.activeCharacterId)) {
+        state.selectedCharacterId = state.activeCharacterId;
+        return;
+    }
+    state.selectedCharacterId = state.selectedCampaign.characters.length > 0
+        ? state.selectedCampaign.characters[0].id
+        : null;
+}
+function resolveSelectedCharacterId() {
+    if (!state.selectedCampaign) {
+        return null;
+    }
+    syncSelectedCharacter();
+    return state.selectedCharacterId;
+}