Somebody who is a pal, companion, amigo, bro, ally, homie, mate, alter ego, buddy, chum, compadre, comrade, confidant, confidante, crony, familiar, intimate, advocate, advocator, apostle, backer, booster, champion, espouser, exponent, expounder, gospeler (or gospeller), herald, hierophant, high priest, paladin, promoter, proponent, protagonist, supporter, true believer, tub-thumper,
white knight,
acquaintance
associate, cohort, colleague, companion, fellow, hearty, hobnobber, partner, peer, sport
blood brother, brother, main man, sister to you.
Somebody who is not your enemy
Hey friend, pal, companion, amigo, bro, ally, homie, mate, alter ego, buddy, chum, compadre, comrade, confidant, confidante, crony, familiar, intimate, advocate, advocator, apostle, backer, booster, champion, espouser, exponent, expounder, gospeler (or gospeller), herald, hierophant, high priest, paladin, promoter, proponent, protagonist, supporter, true believer, tub-thumper,
white knight,
acquaintance
associate, cohort, colleague, companion, fellow, hearty, hobnobber, partner, peer, sport
blood brother, brother, main man, sister