I love Aukiras ^^, As well as Zenirix and (teen) Tesuri and Omni and Ahea and baby Mirabilis and Draqua were cute before the revamp. Uilus are very cute too. RSTU001 is cool, and Gondras are cute, and Verams were so cute but aren't so cute anymore... oh yes and I really loved Valabex before the revamp.
.... XD
If I really had to narrow it down, I love Aukira the most. Started collecting them recently :)