Ningame

is a large red tortoise and Might Guy's personal summon. Ninkame watches over Rock Lee when Guy isn't around. He has only been summoned once during the series, and even then it was off screen, keeping with Guy's habit of only being seen using taijutsu.

Trivia
It could be considered ironic that Guy's summon is a tortoise. Tortoises are normally regarded as slow while Guy's entire fighting style focuses around speed and agility.