I'm gonna have to go with Cliff
He has such a great background story and his personality is amazing.
Gray's second because he's cute and I like quiet guys most of the time.
But Kappa is such a womanizer and has a special way with words, especially when you propose to him:
Kappa:.......Okay, I'll marry you. Don't come back. *disappears back into lake*
And then at the wedding:
Carter: Who'd have thought you can marry Kappa? It's just cool.
Kappa: ... ... ...
The day after the wedding:
Kappa: I can only live in the water...I'm going back to the lake...*disappears*
Claire: ... Why did he marry me?