is it possible to be a character twice? like you were them in one life, and then you were them again in a different au and life? I’m not personally but do you think it’s possible

Honestly, anything’s possible, anon. The multiverse, and the mind are mysterious, poorly understood places, so its hard to rule anything out. I know of a number of Homestuck kin specifically who seem to have been the same person through multiple timelines. (its sort of the case with me as well)