Well it had to happen eventually. My own My Little Pony OC. Infinity is a character I've kind of been working on for awhile, initially he was little more than another persona for myself just in pony form. It wasn't until recently that I took a very different approach to him.

Very similar to that of the Watcher from Marvel, Infinity is responsible for overseeing all possible realities and making sure that order is upheld in them... however no one ever said he was good at this! Cursed with the attention span of a fly and the maturity of a child, this job gets boring for Infinity, so he'll greatly misuse his amazing powers of (but not entirely limited to) time travel to either play with other ponies or essentially create "What If" scenarios for them.

These are often harmless and meant to benefit others, but these do have a tendency to go very wrong. Basically, every possible spin-off or horrible reimagining of the series has more than likely been his doing. Cupcakes? Yeah not one of his better ones... despite his mix ups though, Infinity always fixes them in the end, however this constant screwing with reality and the time line has not awarded him any brownie points with Princess Celestia or Luna. I guess if I were in charge of respectively raising the sun and moon I'd be pissed off at the guy who keeps warping time too!

In terms of personality, think of a benevolent Discord. (fun fact, both know each other and have been known to be mild friends, however Infinity dislikes how far Discord goes with things and Discord finds Infinity a spoil sport) That or the Warden from Superjail. He's an overly thematic man child with a job that demands far more seriousness than he has. This color scheme is not his official one (though part of me is thinking of making it so) he can change his color scheme at will and does so often, the only constant on him is his Cutie Mark.

((character is mine, all concepts of Friendship is Magic are copyright Hasbro))