Kaze no Stigma, Tate no Yuusha no Nariagari Recommendations
Both MCs are outcasted by those they trusted and then after become OP badasses.
+ Both feature an outcast / black sheep protagonist
+ Both protagonists become extremely powerful as they fight for revenge
+ Both protagonists are cynical but slowly develop a soft side for the right people
+ Both protagonists go on a rampage that is stopped by their "female companion"