Toaru Majutsu no Index, Rewrite Recommendations
-Both of The Main Characters in their Perspective Series (Touma and Kotarou) are known as the Weak ones But They have some kind of Overpower Ability tho.
-Similar Fighting Style and Some of The Attacks they use are similar to one another as well tbh.
-Both of The MC's have a Harem.
-Accelerator and Yoshino have Similar Personalities and Likes To Fight for no reason Whatsoever (But Accelerator is a little bit more Crazy tbh).
If you Like Toaru or Rewrite Then you Might Like those two Anime tbh.
Both feature a protagonist with powers that can't be explained, surrounded by pretty girls and gradually getting swallowed into a plot with world-altering consequences.