diff --git a/README.md b/README.md
index 5d3b8c21..77345dc0 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@ pip install -U git+https://github.com/KT-Yeh/mihomo.git
 ```
 
 ## Usage
+
+### Basic 
 An example for https://api.mihomo.me/sr_info_parsed/800333171?lang=en
 
 ```py
@@ -30,11 +32,53 @@ async def main():
     for character in data.characters:
         print("-----------")
         print(f"Name: {character.name}")
-        print(f"rarity: {character.rarity}")
+        print(f"Rarity: {character.rarity}")
         print(f"Level: {character.level}")
         print(f"Avatar url: {client.get_icon_url(character.icon)}")
         print(f"Preview url: {client.get_icon_url(character.preview)}")
-        print(f"portrait url: {client.get_icon_url(character.portrait)}")
+        print(f"Portrait url: {client.get_icon_url(character.portrait)}")
 
 asyncio.run(main())
-```
\ No newline at end of file
+```
+
+### Tools
+`from mihomo import tools`
+#### Remove Duplicate Character
+```py
+    data = await client.fetch_user(800333171)
+    data = tools.remove_duplicate_character(data)
+```
+
+#### Merge Character Data
+```py
+    old_data = await client.fetch_user(800333171)
+
+    # Change characters in game and wait for the API to refresh
+    # ...
+
+    new_data = await client.fetch_user(800333171)
+    data = tools.merge_character_data(new_data, old_data)
+```
+
+### Data Persistence
+Take pickle and json as an example
+```py
+import pickle
+import zlib
+from mihomo import MihomoAPI, Language, StarrailInfoParsed
+
+client = MihomoAPI(language=Language.EN)
+data = await client.fetch_user(800333171)
+
+# Save
+pickle_data = zlib.compress(pickle.dumps(data))
+print(len(pickle_data))
+json_data = data.json(by_alias=True, ensure_ascii=False)
+print(len(json_data))
+
+# Load
+data_from_pickle = pickle.loads(zlib.decompress(pickle_data))
+data_from_json = StarrailInfoParsed.parse_raw(json_data)
+print(type(data_from_pickle))
+print(type(data_from_json))
+```
diff --git a/examples/basic.py b/examples/basic.py
new file mode 100644
index 00000000..04bae385
--- /dev/null
+++ b/examples/basic.py
@@ -0,0 +1,27 @@
+import asyncio
+
+from mihomo import Language, MihomoAPI
+
+client = MihomoAPI(language=Language.EN)
+
+
+async def main():
+    data = await client.fetch_user(800333171)
+
+    print(f"Name: {data.player.name}")
+    print(f"Level: {data.player.level}")
+    print(f"Signature: {data.player.signature}")
+    print(f"Achievements: {data.player_details.achievements}")
+    print(f"Characters count: {data.player_details.characters}")
+    print(f"Profile picture url: {client.get_icon_url(data.player.icon)}")
+    for character in data.characters:
+        print("-----------")
+        print(f"Name: {character.name}")
+        print(f"Rarity: {character.rarity}")
+        print(f"Level: {character.level}")
+        print(f"Avatar url: {client.get_icon_url(character.icon)}")
+        print(f"Preview url: {client.get_icon_url(character.preview)}")
+        print(f"Portrait url: {client.get_icon_url(character.portrait)}")
+
+
+asyncio.run(main())
diff --git a/examples/data_persistence.py b/examples/data_persistence.py
new file mode 100644
index 00000000..7eb933b0
--- /dev/null
+++ b/examples/data_persistence.py
@@ -0,0 +1,25 @@
+import asyncio
+import pickle
+import zlib
+
+from mihomo import Language, MihomoAPI, StarrailInfoParsed
+
+
+async def main():
+    client = MihomoAPI(language=Language.EN)
+    data = await client.fetch_user(800333171)
+
+    # Save
+    pickle_data = zlib.compress(pickle.dumps(data))
+    print(len(pickle_data))
+    json_data = data.json(by_alias=True, ensure_ascii=False)
+    print(len(json_data))
+
+    # Load
+    data_from_pickle = pickle.loads(zlib.decompress(pickle_data))
+    data_from_json = StarrailInfoParsed.parse_raw(json_data)
+    print(type(data_from_pickle))
+    print(type(data_from_json))
+
+
+asyncio.run(main())
diff --git a/examples/merge_data.py b/examples/merge_data.py
new file mode 100644
index 00000000..c30d8b6b
--- /dev/null
+++ b/examples/merge_data.py
@@ -0,0 +1,19 @@
+import asyncio
+
+from mihomo import Language, MihomoAPI, tools
+
+
+async def main():
+    client = MihomoAPI(language=Language.EN)
+    old_data = await client.fetch_user(800333171)
+
+    # Change characters in game and wait for the API to refresh
+    # ...
+
+    new_data = await client.fetch_user(800333171)
+    data = tools.merge_character_data(new_data, old_data)
+
+    print(data)
+
+
+asyncio.run(main())
diff --git a/mihomo/client.py b/mihomo/client.py
index 0d5d6db5..1243f1cf 100644
--- a/mihomo/client.py
+++ b/mihomo/client.py
@@ -10,6 +10,7 @@ from .tools import remove_empty_dict, replace_trailblazer_name
 
 class Language(Enum):
     CHT = "cht"
+    CHS = "chs"
     DE = "de"
     EN = "en"
     ES = "es"
@@ -63,7 +64,9 @@ class MihomoAPI:
 
         """
         url = self.BASE_URL + "/" + str(uid)
-        params = {"lang": language.value}
+        params = {}
+        if language != Language.CHS:
+            params.update({"lang": language.value})
         async with aiohttp.ClientSession() as session:
             async with session.get(url, params=params) as response:
                 if response.status == 200: