Plagg. He so cool, funny and he is literally better for Adrien than any human in that house with the exception of Gorilla, I'm not against Nathalie but "better late than never".
Plagg offering to cataclysm Chloe for insulting Zoe is one of the best jokes in this show, and honestly speaking, I liked Tikki and Plagg as much as Adrien and Marinette theirself.