Leon (Sonic X)
From Sonic Retro
Leon is a character from the anime series Sonic X, he is Molly's former ally, and a trusted fighter alongside her, but he betrayed her after failing the war against the Metarex. Knowing that she wouldn't like his plan, Leon asked Molly to return to their base to pick up some files, which was set to explode. He was consumed by a tree and apparently died.