If anything, though, a Anri sounds like he'd make a better RPG than a strategy game

(side-scroller!)
Hacking could be a possiblity only if Anri had a face and battle sprite. We don't even know what the heck that he look like.
So? That's why you make one. ROM hacking isn't about spiffing levels and stats together, it's about creating a new experience using a limited base. If there's no indication to what a person looked like you take liberty and create your own

If I didn't have a streak of never finishing any projects, it sounds kinda like something I'd be interested in >.<