I like the idea of crafting Lil Thrax to make it stronger. I do suggest using pets that are still readily available to purchase via Plat on game.

Slayte, lavender and peri Winkle can be purchased from The Beast Master in Oktal Towne still.

If you have the option of crafting a Warbird, Tinsel or Gleam all these pets are discontinued and will be lost in circulation for ever.