Self-seeker

(n.) One who seeks only his own interest, advantage, or pleasure.

Thesaurus Entries

careerist, egotist, fortune hunter, grouch, hog, individualist, killjoy, lone wolf, loner, malcontent, monopolist, narcissist, road hog, self-advancer, self-pleaser, self-seeker, self-server, sourpuss, spoilsport, temporizer, timepleaser, timeserver, tufthunter, wet blanket