Thunderblaze is a large, dark grey lion with jagged yellow streaks across his face and body. He has bright yellowish-orange eyes, a thick dark grey mane, a muscular body, long legs, and sharp fangs.
Thunderblaze is a mean, nasty, short-tempered lion who is plotting revenge against his brother, Scorchfire. He is stubborn and vicious, and he will stop at nothing to get his way and kill his brother.
Like other Fire Lions, he has the ability to control fire, but he can also summon thunderstorms and lightning.