A snarky human, a peacekeeper (who kicks major ass and steals his heart), a Delvian, a Luxan, a Hynerian, a Nebari, a Stykera, and a half breed Sebacean/Scarran.
Now that's a crew! And the ship was sentient. Moya is a living ship and the inspiration for the ship (and story) in Deadly Beauty.
There have been post after post about the Love between Crichton (human) and Aeryn (peacekeeper). My choice for the longest lasting and most stable relationship on this show was between the Pilot and Moya.
Pilot connected to and flying Moya.
Pilot has multiple limbs and is actually connected to the ship. He steers the ship, translates her for the crew, and when she gets hurt, he becomes ill. Now that is Love.