Here's the list of items and how they affect both Pandasoul and Booboo. Keep in mind that Pandasoul's Ultimate form will be affected by the other avatars that you collect from the Sang-La patch.
Hopefully this solution helps resolve some of the problems with the avatar, and that you're able to give it a try!
- Boots (any) - Fur leggings
- Shaman's Headdress - Headdress
- Charged Hammer(Thunderclaw) - Bamboo skirt
- Brutalizer - Fur arm-guards
- Frostwolf Skull - Backpack
- Dawnbringer - Larger weapon
- Mock of Brilliance - Aura
- Demonic Breastplate(Bulwark) - Butt Armor
- Brutalizer - Helm
- Charged Hammer (Thunderclaw) - Flags
- Boots (any) - Leg Guards
- Savage Mace -Spikes on Armor