Damn it dog! Take this shit seriously, or we're going to have to find a new manager!
...This is acceptable...
time to get down to serious business then.
All I can think of is Jotaro.
There are tons. But some aren't from shounen stuff like yahari, Kirito kinda counts, belzeebub's main character is kinda anti-social, kira from deathnote?, Guts post golden age, and a ton of lone wolf characters. There are more relevant ones, but i can't think of any.