I've been examinating the MH couples lately, and I've notice that almost every couple are opposites:
Cleo & Deuce: Cleo's like a diva, with her bling and sexy style, Deuce is a punk rebel guy, without mentiong they come from 2 of the most famous dynasties of history, Egypt & Greece. Also Cleo's the leader of the fearsquad while Deuce is just a random player.
Clawd & Draculaura: The sun and the moon, even though Clawd goes crazy when he sees the full moon, he's nice and sweet atitude and his casual but very fashionable style makes him a perfect sunlight for the goth style of Draculaura. Besides he's really tall and the casketball and soccer leader while Draculaura is really short and a random fearleader.
Lagoona & Gil: They both are water monsters, but Lagoona is a sea monster which means she's from salty water, Gil's a river monster which makes him a fresh water guy, pretty much everybody watched the drama on the webisodes.
Abbey & Heath: I know, I know... They're not a couple, they don't even speak to each other that much on the webisodes, but in Abbey's diary she said Heath was very cute but she woudn't date him until a "proper invitation". Fire and Ice, SO CUTE!!! <3
Frankie & Jackson: Could it be that Jackson's is ubberly shy and Frankie is a social butterfly? It's possible.
theris a speed dating episode with frankie and she choose heath
the episode i'm talking of is on the french website