I'm really surprised I haven't seen a post about this. There are episode cards from this show that I would hang up in my house. They really feels like some kind of old Fairy tail book.
Mr Satan (dragon ball): Mr. Satan is essentially a joke character and a meme, given that the entire planet views him as a hero even though he never actually fights. However, this fame isn't entirely undeserved. Mr. Satan is truly a beast—capable of lifting boulders with one hand and smashing them with his head—and a skilled fighter. But of course, in a universe where the norm is firing energy blasts capable of destroying mountains, he falls a bit behind.
Haru Urara (Uma Musume: Pretty Derby):It is explicitly stated in the game that Haru lacks the level required for the academy, and every piece of media in the franchise makes this clear. She is the worst character in the game—viable only in very specific races, and not even the best choice for those—never winning anything and generally lagging far behind the other Umas.
That said, in the world of *Uma Musume*, the Umas are just as strong and fast as real horses—Haru included. This means that this little pink thing could break the ribs of adult men from our world with a single punch and leave any sprinter in the dust (though she’d still lose to actual horses, lol).
James (Smiling Friends): He spends the episode mistreating—and essentially assaulting—Charlie, only to smile after stabbing someone to death. By the end of the episode, he’s seen crying and drinking in his trashed apartment, lamenting—yet again—having driven away the people who cared about him.
Anko Uguisu/Kyoko Mejiro: Throughout the first season, her mere presence completely kills the show's cheerful vibe whenever she appears, and she clearly knows more about vampires than the characters themselves do. In the second season, she becomes the main antagonist, aiming to take her own life in order to wipe out the vampires. It is revealed that she dedicated the last ten years of her life to this plan; when both the plan and a subsequent suicide attempt go wrong, she confesses that she wasted her time and has no idea what to do with her life.
Edit: I see some people aren't quite getting the point. I’m not talking about characters who seem threatening but turn out to be total softies. I’m referring to characters who are intimidating because they actually pose a threat, yet their lives are a total disaster—almost always due to their own actions.
Sae Niijima (persona 5): Envy.
Merlín (Nanatsu no Taizai): Gluttony
Leviathan (Hazbin Hotel/Helluva Boss): Envy.