Accute Love Triangle: Two people who are boning, but they wistfully pine for a third person from afar.

Obtuse Love Triangle: Two people pinning for the same third, when they’d be better off hooking up with each other.

Equilateral Love Triangle: When there is no age-gap discourse in the polycule.

Right Love Triangle: When the odd-couple finds the perfect person to square them off.

Stereographically Projected Love Triangle: A romantic Isekai