The Legend of Zelda U - Epona has tree support!

[Kriven]

I think I like Navi more, and associate her more with a friendly character, because she was present throughout the whole adventure. With the other helpers, they're relegated to being unseen until spoken to, either in your sword, or your shadow, or some kind of pendant (the only exception to this being Midna riding on your back, but that's only for a portion of the game). Navi and Tatl are buzzing around you the entire duration of the game, even when they aren't calling you to check something out. They're right there in the battle, zipping over to the baddies, changing colors to indicate new items. Navi is the Tails to Link's Sonic (circa Sonic 2).