Oh all three you haven't watched are the ones that are not much popular these days, especially because of their art
style and themes
Vagabond is based on Yoshioka Eiji's novel, written by same mangaka who made Slam Dunk, it's based on a
Samurai and his spiritual journey while he walks the way of sword. (has some mature scenes in one or two
chapters)
Slam Dunk: One of the best shonen manga i've read, very fast paced and interesting with a disappointingly abrupt
ending, but that makes it short and easier to read (unlike manga like Hajime no Ippo (1000+ chapters) and one piece
(700+) chapters which are too daunting for some to start reading)
Hajime no ippo: again, one of the best shonen manga I've read, it's long, and some arcs are boring, but
it's a very motivating manga for sure. And i think it's the most 'shonen' manga I've read till
date. But it also has many scenes many many references to male genitalia meant for
humor, so not recommended for girls ^^;
My favorite characters from FMA manga are ofc Ed and Al, but also Pride(that badass guy with eyepatch, dunno what
he's called in anime) and Greed (the homunculus that possesses the oriental prince)