I think Charlie would win. Threehorn is bigger and stronger, but he is too stupid, maybe Charlie could outwit him in some way.
1) Littlefoot, Cera, Spike, Ducky, Petrie, Ruby and Chomper vs The Seven Dwarves
2) Cera vs Gollum ( Lord of the Rings)
3) General Woundwort ( Watership Down) vs Tigger (The new adventures of Winnie Pooh)