About a guy who escapes from his overbearing childhood friend and now former girlfriend, and creates a new identity for himself. He starts over as an adventurer and discovers he has an extremely high magic capacity.
A kid who died protecting his friends from a guy with a knife reincarnates into a fantasy world. He starts learning magic at a very young age and is blessed by every god. He becomes super OP by the time he's 12 and even has his own nobility titles. Fair warning though, there are two or three rather annoying girls hanging on to him a lot, which can get kind of annoying.
This one is about a guy who is constantly bullied by his peers and called "fat" and "ugly". Over spring break, he stumbles upon a doorway to another world in his dead grandfather's house. When he passes through he gains a bunch of crazy stats. He wakes up the next morning and has suddenly become "super hot", even though he doesn't realize it yet. He starts leveling up in the alternate world, and back in his world. He basically becomes a badass overnight.
A Sword Master Childhood Friend Power Harassed Me Harshly, So I Broke Off Our Relationship And Make A Fresh Start At The Frontier As A Magic Swordsman.