Aria (FE7)

Fire Emblem (7 but can work for all)!AU Aria replaces Tactician Mark as the armys tactician.

they follow Lyn and Eliwood and helps them with her tacticion-ing. They doesn't actually know what the fuck they're doing most of the time but it works out, especially since with the power of fourth wall fuckery they can just go back in time to when their allies don't die. Also unlike Mark they have overly-overpowered magic and are also equipped with a dagger, but fighting'll tire them out pretty easily especially the overpowered magic.

they will protect Lowen to hell and back. their efforts to marry Lowen with a ring-pop probably won't be accomplished but they'll try.