diff --git a/pandas/core/arrays/base.py b/pandas/core/arrays/base.py
index 5a2643dd531ed..bd01191719143 100644
--- a/pandas/core/arrays/base.py
+++ b/pandas/core/arrays/base.py
@@ -794,7 +794,7 @@ def shift(self, periods: int = 1, fill_value: object = None) -> ExtensionArray:
             b = empty
         return self._concat_same_type([a, b])
 
-    def unique(self):
+    def unique(self: ExtensionArrayT) -> ExtensionArrayT:
         """
         Compute the ExtensionArray of unique values.
 
@@ -1023,7 +1023,7 @@ def factorize(self, na_sentinel: int = -1) -> tuple[np.ndarray, ExtensionArray]:
 
     @Substitution(klass="ExtensionArray")
     @Appender(_extension_array_shared_docs["repeat"])
-    def repeat(self, repeats, axis=None):
+    def repeat(self, repeats: int | Sequence[int], axis: int | None = None):
         nv.validate_repeat((), {"axis": axis})
         ind = np.arange(len(self)).repeat(repeats)
         return self.take(ind)
diff --git a/pandas/core/arrays/interval.py b/pandas/core/arrays/interval.py
index 50e8cc4c82e0d..95c95d98bc968 100644
--- a/pandas/core/arrays/interval.py
+++ b/pandas/core/arrays/interval.py
@@ -1518,7 +1518,11 @@ def delete(self: IntervalArrayT, loc) -> IntervalArrayT:
         return self._shallow_copy(left=new_left, right=new_right)
 
     @Appender(_extension_array_shared_docs["repeat"] % _shared_docs_kwargs)
-    def repeat(self: IntervalArrayT, repeats: int, axis=None) -> IntervalArrayT:
+    def repeat(
+        self: IntervalArrayT,
+        repeats: int | Sequence[int],
+        axis: int | None = None,
+    ) -> IntervalArrayT:
         nv.validate_repeat((), {"axis": axis})
         left_repeat = self.left.repeat(repeats)
         right_repeat = self.right.repeat(repeats)
diff --git a/pandas/core/base.py b/pandas/core/base.py
index 42f52618eb07b..e1e36d6d226c4 100644
--- a/pandas/core/base.py
+++ b/pandas/core/base.py
@@ -16,6 +16,7 @@
 
 import pandas._libs.lib as lib
 from pandas._typing import (
+    ArrayLike,
     Dtype,
     DtypeObj,
     IndexLabel,
@@ -996,7 +997,7 @@ def unique(self):
         values = self._values
 
         if not isinstance(values, np.ndarray):
-            result = values.unique()
+            result: ArrayLike = values.unique()
             if self.dtype.kind in ["m", "M"] and isinstance(self, ABCSeries):
                 # GH#31182 Series._values returns EA, unpack for backward-compat
                 if getattr(self.dtype, "tz", None) is None: