diff --git a/packages/creature/package.json b/packages/creature/package.json
index 97186c1..35fe566 100644
--- a/packages/creature/package.json
+++ b/packages/creature/package.json
@@ -11,6 +11,7 @@
   "license": "MIT",
   "devDependencies": {
     "@types/jest": "^24.0.18",
+    "@types/uuid": "^3.4.5",
     "jest": "^24.9.0",
     "ts-jest": "^24.0.2",
     "tslint": "^5.19.0",
@@ -31,5 +32,11 @@
     "transformIgnorePatterns": [
       "/node_modules/[^@xethya]/"
     ]
+  },
+  "dependencies": {
+    "@xethya/ability": "^0.0.3",
+    "@xethya/definitions": "^0.0.4",
+    "@xethya/race": "^0.0.1",
+    "uuid": "^3.3.3"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/creature/src/creature.ts b/packages/creature/src/creature.ts
index f9bf484..7ce9cf7 100644
--- a/packages/creature/src/creature.ts
+++ b/packages/creature/src/creature.ts
@@ -1 +1,52 @@
-export class Creature {}
+import Ability from "@xethya/ability";
+import { CreatureAlignment, CreatureSize } from "@xethya/definitions";
+import { Race } from "@xethya/race";
+import { v4 as generateUUID } from "uuid";
+
+export type CreatureOptions = {
+  races?: Race[];
+  size?: CreatureSize;
+  alignment?: CreatureAlignment;
+  name?: string;
+};
+
+export class Creature {
+  public readonly races: Race[] = [];
+  public readonly abilities: Map<string, Ability>;
+  public readonly size: CreatureSize = CreatureSize.Medium;
+  public readonly alignment: CreatureAlignment = CreatureAlignment.Neutral;
+  public readonly id: string;
+  public readonly name: string = "Unknown Creature";
+
+  public constructor(options: CreatureOptions = {}) {
+    this.id = generateUUID();
+    this.abilities = new Map<string, Ability>();
+
+    if (options.name) {
+      this.name = options.name;
+    }
+
+    if (options.races) {
+      /**
+       * @todo Should define what it means in terms of attribute dominance
+       * to support multiple races.
+       *
+       * @see https://github.com/xethya/framework/issues/30
+       */
+      this.races = options.races;
+    }
+
+    if (this.races.length === 1) {
+      this.size = this.races[0].size;
+      this.alignment = this.races[0].alignment;
+    }
+
+    if (options.size) {
+      this.size = options.size;
+    }
+
+    if (options.alignment) {
+      this.alignment = options.alignment;
+    }
+  }
+}
diff --git a/packages/creature/tests/creature.test.ts b/packages/creature/tests/creature.test.ts
index e2950f1..adf0f86 100644
--- a/packages/creature/tests/creature.test.ts
+++ b/packages/creature/tests/creature.test.ts
@@ -1,7 +1,83 @@
+import { CreatureAlignment, CreatureSize } from "@xethya/definitions";
+import { Race } from "@xethya/race";
 import { Creature } from "../src/creature";
 
+/**
+ * @todo Move this regex to utils.
+ * @see https://github.com/xethya/framework/issues/33
+ */
+const UUID_REGEX = /^[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}$/;
+
 describe("Creature", () => {
-  it("can be instantiated", () => {
-    expect(new Creature()).toBeDefined();
+  it("should instantiate a Creature without parameters", () => {
+    const creature = new Creature();
+    expect(creature.id).toMatch(UUID_REGEX);
+    expect(creature.name).toEqual("Unknown Creature");
+    expect(creature.abilities.size).toEqual(0);
+    expect(creature.races.length).toEqual(0);
+    expect(creature.alignment).toEqual(CreatureAlignment.Neutral);
+    expect(creature.size).toEqual(CreatureSize.Medium);
+  });
+
+  it("should instantiate a Creature with alignment", () => {
+    const creature = new Creature({
+      alignment: CreatureAlignment.LawfulNeutral,
+    });
+    expect(creature.alignment).toEqual(CreatureAlignment.LawfulNeutral);
+  });
+
+  it("should instantiate a Creature with name", () => {
+    const creature = new Creature({
+      name: "Foo",
+    });
+    expect(creature.name).toEqual("Foo");
+  });
+
+  it("should instantiate a Creature with name", () => {
+    const creature = new Creature({
+      size: CreatureSize.Tiny,
+    });
+    expect(creature.size).toEqual(CreatureSize.Tiny);
+  });
+
+  it("should instantiate a Creature with a single race", () => {
+    const Feline = new Race({
+      size: CreatureSize.Small,
+      alignment: CreatureAlignment.NeutralEvil,
+    });
+
+    const creature = new Creature({
+      races: [Feline],
+    });
+
+    expect(creature.races).toEqual([Feline]);
+    expect(creature.size).toEqual(Feline.size);
+    expect(creature.alignment).toEqual(Feline.alignment);
+  });
+
+  /**
+   * @todo Should define what it means in terms of attribute dominance
+   * to support multiple races.
+   *
+   * @see https://github.com/xethya/framework/issues/30
+   */
+  it("should instantiate a Creature with multiple races", () => {
+    const Feline = new Race({
+      size: CreatureSize.Small,
+      alignment: CreatureAlignment.NeutralEvil,
+    });
+
+    const Human = new Race({
+      size: CreatureSize.Large,
+      alignment: CreatureAlignment.NeutralGood,
+    });
+
+    const creature = new Creature({
+      races: [Feline, Human],
+    });
+
+    expect(creature.races).toEqual([Feline, Human]);
+    expect(creature.size).toEqual(CreatureSize.Medium);
+    expect(creature.alignment).toEqual(CreatureAlignment.Neutral);
   });
 });
diff --git a/tslint.json b/tslint.json
index 41fe693..18ff0e1 100644
--- a/tslint.json
+++ b/tslint.json
@@ -7,7 +7,8 @@
     "member-ordering": false,
     "member-access": false,
     "no-bitwise": false,
-    "interface-over-type-literal": false
+    "interface-over-type-literal": false,
+    "object-literal-sort-keys": false
   },
   "rulesDirectory": []
 }
diff --git a/yarn.lock b/yarn.lock
index dc07157..c5e6293 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1206,6 +1206,13 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-1.0.1.tgz#0a851d3bd96498fa25c33ab7278ed3bd65f06c3e"
   integrity sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==
 
+"@types/uuid@^3.4.5":
+  version "3.4.5"
+  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-3.4.5.tgz#d4dc10785b497a1474eae0ba7f0cb09c0ddfd6eb"
+  integrity sha512-MNL15wC3EKyw1VLF+RoVO4hJJdk9t/Hlv3rt1OL65Qvuadm4BYo6g9ZJQqoq7X8NBFSsQXgAujWciovh2lpVjA==
+  dependencies:
+    "@types/node" "*"
+
 "@types/yargs-parser@*":
   version "13.0.0"
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-13.0.0.tgz#453743c5bbf9f1bed61d959baab5b06be029b2d0"
@@ -6396,6 +6403,11 @@ uuid@^3.0.1, uuid@^3.3.2:
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.3.2.tgz#1b4af4955eb3077c501c23872fc6513811587131"
   integrity sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==
 
+uuid@^3.3.3:
+  version "3.3.3"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.3.3.tgz#4568f0216e78760ee1dbf3a4d2cf53e224112866"
+  integrity sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==
+
 validate-npm-package-license@^3.0.1, validate-npm-package-license@^3.0.3:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz#fc91f6b9c7ba15c857f4cb2c5defeec39d4f410a"