Tree Rex's #1 Fan is a young Mabu companion who appears only in Skylanders: Lost Islands. As his name suggests, he is Tree Rex's biggest fan. Once recruited, Tree Rex's #1 Fan will give out 25% more Gold from everything Tree Rex (and Gnarly Tree Rex) does, and also unlocks an exclusive adventure called Tree Rex's Tree Fort.
There's no bigger Tree Rex fan in all the Skylands. Cheering as Tree Rex tackles Trolls or scares off Sheep, Tree Rex's #1 Fan is always there waving a Tree Rex flag. "What is one thing you would tell Tree Rex, if you had a chance?" Tree Rex's #1 Fan says: "I've planted ten trees in my backyard!"
He is currently the only Number 1 Fan of a Giant Skylander.