My favourite pet which is quite cute is fairy mite, I find the way it hops round in circles rather endearing. I like Sakurako and Komachi too.
Ugliest pet, definitely Nyxx in all her guises. Too much ghostly-white flesh, ugh...
Lv. 22x SM; lv. 25x (mad) Scientist
Amatsubame, Lv. 68 Chaosmage
Lv. 85 Elf Loremaster