diff --git a/.flake8 b/.flake8
index c747e10..4864a54 100644
--- a/.flake8
+++ b/.flake8
@@ -11,6 +11,7 @@ extend-ignore =
     D401, # First line should be in imperative mood; try rephrasing
     D400, # First line should end with a period
     D101, # Missing docstring in public class
+    D106, # Missing docstring in public nested class
 
     # Plugins we don't currently include: flake8-return
     R503, # missing explicit return at the  end of function ableto return non-None value.
diff --git a/jarvis_core/db/models.py b/jarvis_core/db/models.py
index e8325ad..ffb0019 100644
--- a/jarvis_core/db/models.py
+++ b/jarvis_core/db/models.py
@@ -197,6 +197,9 @@ class TwitterAccount(Document):
     last_tweet = fields.IntegerField(required=True)
     last_sync = fields.DateTimeField(default=datetime.utcnow)
 
+    class Meta:
+        collection_name = "twitteraccount"
+
 
 @JARVIS_INST.register
 class TwitterFollow(Document):
@@ -210,6 +213,9 @@ class TwitterFollow(Document):
     admin = fields.IntegerField(required=True)
     created_at = fields.DateTimeField(default=datetime.utcnow)
 
+    class Meta:
+        collection_name = "twitterfollow"
+
 
 @JARVIS_INST.register
 class Unban(Document):
diff --git a/jarvis_core/util/ansi.py b/jarvis_core/util/ansi.py
new file mode 100644
index 0000000..af470e3
--- /dev/null
+++ b/jarvis_core/util/ansi.py
@@ -0,0 +1,75 @@
+"""ANSI color helper."""
+from enum import Enum, EnumMeta
+from typing import Any, List
+
+ESCAPE = "\u001b"
+RESET = ESCAPE + "[0m"
+
+
+class SearchableEnum(EnumMeta):
+    def __contains__(cls, item: Any):
+        return item in [v.value for v in cls.__members__.values()]
+
+
+class Format(Enum, metaclass=SearchableEnum):
+    NORMAL = 0
+    BOLD = 1
+    UNDERLINE = 4
+
+
+class Fore(Enum, metaclass=SearchableEnum):
+    GRAY = 30
+    RED = 31
+    GREEN = 32
+    YELLOW = 33
+    BLUE = 34
+    PINK = 35
+    CYAN = 36
+    WHITE = 37
+
+
+class Back(Enum, metaclass=SearchableEnum):
+    DARK_BLUE = 40
+    ORANGE = 41
+    DARK_GRAY = 42
+    GRAY = 43
+    LIGHT_GRAY = 44
+    INDIGO = 45
+    LIGHTER_GRAY = 46
+    WHITE = 47
+
+
+def fmt(*formats: List[Format | Fore | Back] | int) -> str:
+    """
+    Get format string.
+
+    Args:
+        formats: List of format modifiers
+
+    Return:
+        Format string
+    """
+    fore = ""
+    back = ""
+    fmt = ""
+    block_fmt = False
+    for f in formats:
+        if isinstance(f, Enum):
+            f = f.value
+        if f == 0:
+            fmt = "0;"
+        elif f in [1, 4]:
+            if str(f) not in fmt and not block_fmt:
+                fmt += f"{f};"
+        elif 30 <= f <= 37:
+            fore = f"{f};"
+        elif 40 <= f <= 47:
+            back = f"{f};"
+
+    ret = fmt + fore + back
+    if not any(ret, fore, back):
+        ret = RESET
+    if ret[-1] == ";":
+        ret = ret[:-1]
+
+    return ESCAPE + "[" + ret + "m"
diff --git a/pyproject.toml b/pyproject.toml
index d3e7507..f2ec084 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "jarvis-core"
-version = "0.4.1"
+version = "0.5.0"
 description = ""
 authors = ["Your Name <you@example.com>"]