The main concern are his features during Bloodrush. In essence, Bloodrush is a temporary state. While emotional and mental effects, along with more minor physical features, can understandably linger, a large set of wings sticking around for a week and rotting away is out of bounds for the concept. We have attempted to clarify this in the Guidebook, apologies if it was unclear.
He can certainly grow the wings but we suggest further limiting how long they stay. For example, they could fall off altogether when Bloodrush ends or the feathers could fall away and he’s left with wing nubs for a week.
When you’ve gotten that squared away, let us know in #mod-request. Thank you!