Semi Formal Asterion looks great imo, matches with his now profesionally playful personality
This is exactly my Asterion, for exactly the same reasons! Mind you, the glasses are a bit luck based so I don't have it in all my routes (which I actually love, each route feels a little unique because he gets to be gold in one, cowprint in another, etc), but if I were to pick my favorite, it's this one, swapping in the suspenders when it's a 'Luke Lounge' playthrough.