牛比轰轰 is not "powerful than a bull"... its kinda of like a slang in china... meaning bragging... or awesome btw, thanks for translating
A shame about the "no harem"... But it seems really cool and funny. I find over the top MCs really amusing.
you can use it to praise someone or ridicule or mock someone... gotta see in which context. but i wont say its a curse word.
The mc is not biesexual lol he meant he doesn't descrimate between males and females fight wise not sexual wise