I like hardcore action with a main protagonist a guy, just don't like that female is protagonist. I 'm not anti-feminist, I have utmost respect of girls, just saying(don't hate me :D). There must be romance(a kiss or some action, you know héhé) oké continue some humor and horror too.
My really favorite genre mafia(yakuza) style or delinquent like Sanctuary, Angel densetsu, Sun-ken Rock etc.
Second favorite genre psychological or mystery manga Usogui, gamble fish, One outs, etc.
Thats it may change in the future.
Alone is not a bad way to be;
it clears your head and focuses you on the journey.
Cherish the short intervals during the quest you have with others,
but be prepared to walk alone in the darkness.