could Noir have just... chosen the cooler prototypings to keep active at all times? because Bec needs to be there in order for him to use any of his First Guardian powers, the sword and the wings are necessary for fighting and flying respectively, and the single arm is the only thing remaining from Harlequinsprite but that's likely something that he can't actually change... and then there's Jaspersprite, who has... what exactly to benefit Noir?

Cat princessness. Appetite for fish. Chances are he can’t just turn off everything, but having tentacles all the time and also being a dog and having wings may have ruined the look, so he only gets them at times.