If you want to avoid wasting entire evenings on profiles that do not fit, you need to know how to spot a good gaming teammate before the first match even starts. A few simple signals are enough to tell which profiles deserve a real test session — and that is often where long-term compatibility is decided.
A good gaming teammate can often be identified before the first match. The strongest signals are the clarity of the first exchange, the consistency between what the person says and wants, their real schedule, their voice-chat habits, and how easily they propose replaying if the fit is good.