The Gadites who joined David in the wilderness had faces like those of which animal?

Answer: Lions

These Gadite warriors, skilled with shield and spear, had faces like the faces of lions and were as swift as gazelles on the mountains.

“Some Gadites defected to David at his stronghold in the wilderness. They were mighty men of valor, trained for battle, experts with the shield and spear, whose faces were like the faces of lions and who were as swift as gazelles on the mountains:”— 1 Chronicles 12:8 (BSB)