Enter Y/N "Mark"L/N

RWBY X Male reader but you're an appropriately powered Isekai hero

Whilst on a walk Mark Oath is attacked by a girl he rejected earlier that day and is sadly killed, but what's this? A sleep-deprived kid wearing way too much grey saying he's God? Reincarnation? A whole new world with new abilities? I get to keep my power? Man, this is pretty interesting.