In Monster Hunter Tri, you could outfit your companion, Cha-Cha, with different masks. Each mask would give Cha-Cha different abilities, but also change his personality. As previously reported, in addition to Cha-Cha, Monster Hunter 3G has a second companion named Kayamba. It also features three more masks:
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Whetstone Mask: Use Kayamba to sharpen your weapon!
Negation Mask: You can signal to Kayamba to help remove status ailments such as resistance decreases.
Dung Mask: Kayamba gains the ability to toss Dung Bombs.
Cha-Cha and Kayamba also dance, which gives you (or them) ability or status boosts.