I got a 5* Rebecca from free summon. What should I do with it?

Rebecca was pretty subpar in the first place, and those IVs don't help at all. Free Darting Blow?

i run silver bow on klein wih the speed refine just for the heck of it and c his title is silver nobleman and he reaches a nice speed tier with LnD

50 atk and 43 spd kinda helps pull him out of the gutters but the lack of effect on the bow is what kinda hinders him and ypu can get a better build with slaying bow+ but i prefer to give him the extra mt

Honestly, if it were me I'd just send her home. As much as it sucks to trade a 5* pull for 1K feathers, I'd rather that than have a unit I'll never use and has no skill fodder potential for me sitting in my limited space barracks. I've done it more times than I care to recall.