Ha! Believe it or not, I hadn't thought about that. But now that you mention it, he could be a 458. I don't think it can be doubted that Kuroro is INFJ.
I think the 458 suits him quite well actually, though I don't know if he would be core 5 or 4. But then, sometimes I wonder about that too (for myself, that is). He is also an INFJ with strong Ti, like me, with leadership qualities, like me. Oh my god, I am Kuroro!
Isn't that Genryūsai Shigekuni Yamamoto from Bleach? Although, having said that, Netero seems a very accurate anime alter-ego for you Wyote. Or maybe Makarov Dreyar of Fairy Tail, although he's a very similar (ahem, identical?) character to Netero.