 If you liked
Shamo
|
 ...then you might like
The World Is Mine
|
Both manga leads the readers to root for the protagonist, despite it's morally indefensible acts.
While Shamo worries more about developing a single character, it never really develops anything past the "corrupted by society" trope, while TWiM world is richer not only in terms of characters, but also reasons for their development and goals.