Haha! Funny you see Shin in Carlos! I actually see more of Juuichi in him, but that's just me...
Hmmmm, now you say that i really get what you mean and i do suppose that it's almost a mix between the two.Because Shin was like a quiet meek character who likes reading thats pretty much how i saw him in Carlos but i guess Juuichi has the same similarities for example; body size, grumpy attitude and the sort of loneliness that Carlos has. Although this is just my thought on your reply so, yeah.