diff --git a/transformers/UserTransformer.tsx b/transformers/UserTransformer.tsx
new file mode 100644
index 00000000..225b1aa1
--- /dev/null
+++ b/transformers/UserTransformer.tsx
@@ -0,0 +1,26 @@
+// Transforms API response to User object
+export function toObject(data: any): User {
+  return {
+    id: data.id,
+    username: data.username,
+    avatar: {
+      picture: data.avatar.picture,
+      element: data.avatar.element,
+    },
+    gender: data.gender,
+    language: data.language,
+    theme: data.theme,
+  } as User
+}
+
+// Transforms User object into API parameters
+export function toParams(data: User): UserParams {
+  return {
+    username: data.username,
+    picture: data.avatar.picture,
+    element: data.avatar.element,
+    language: data.language,
+    gender: data.gender,
+    theme: data.theme,
+  }
+}
diff --git a/types/User.d.ts b/types/User.d.ts
index b79e76f2..e80c561c 100644
--- a/types/User.d.ts
+++ b/types/User.d.ts
@@ -7,4 +7,6 @@ interface User {
     element: string
   }
   gender: number
+  language: string
+  theme: string
 }
diff --git a/types/UserParams.d.ts b/types/UserParams.d.ts
new file mode 100644
index 00000000..e7c92d57
--- /dev/null
+++ b/types/UserParams.d.ts
@@ -0,0 +1,8 @@
+interface UserParams {
+  username?: string
+  picture?: string
+  element?: string
+  language?: string
+  gender?: number
+  theme?: string
+}