Does a character who's a time traveler make sense or work in the lore?

[Emrsnn]

I think we generally accept whatever as long as it's done with some effort and doesn't give you an unfair advantage. (like there was a gripe a lot of people had a few years ago about if characters wearing sunglasses and gas masks as part of their "lore" gave them too much of a mechanical advantage)
so as long as you're not doing anything too wild like "actually, you didn't shoot my guy because my guy traveled through time and saw that you were gonna shoot him so he shot you first so actually youre dead now instead", I reckon nobody will complain

but in my personal opinion, if the canon is already making people immortal by transferring their souls into cloned bodies , time travel seems well within reason