Pets

Pets are little critters that follow you around. Like summoned minions, pets are totally invincible, and they have no duration - they will follow you until you die, summon a different pet, or cancel the associated buff. Most are purely cosmetic, but some of the console-exclusive pets can do small amounts damage to enemies.

Console
You can also get "Elfa" in the android and ios terraria by cutting down trees.