Tsuyu Asui/Tsu from My Hero Academia is the most useless, overrated character from the series. How on earth did she capture the hearts of fans? How did she even pass the entrance exam in the first place? Her quirk is doing basically what a frog can do. It doesn't give her the physical strength to destroy a robot. Plus, the only way she attacks is using her tongue to whip opponents. On top of all, it was mentioned by Recovery Girl that Tsu has no known weakness.
.·. Tsu= Mary Sue