opp-lover

An opp-lover is a person who associates with/ is kinfolk to/ supports/ and/or presides in the company of your opps. An opp-lover may not directly be in active competition with you, but they are no less of a threat, and are even less deserving of respect/humility, as they are passively against you. They don't choose up, they wade in the middle, switching sides constantly, playing both teams, they stand for nothing, they are usually a 'yesman', and they are never worth having around. Opp-lovers are almost worse than an actual opp.

Michael knows how malicious Xavier is and how badly he treated me, yet they were hanging out together yesterday. What a squishy little opp-lover.