I'd love to see Etsuo in your style!
(This compliation is kinda a mix, 3 of them is present time, while the others are 2-3 years older - I love to play with the tought of a time-skip in the future, it's so fun to draw - even if it's isn't canon yet
)
As for the bio... well, let's just say he is a very troubled child...
Son of the most powerful mafia family from which he kinda ran away, but he has to realise that he is no better, in fact, he has a repressed darker side that he struggles with.