Yali is a character in appearing in the mid-credit scene of "That's One Small Step for Man..." and will play an important role in its sequel "... One Giant Leap for Mankind". He is portayed by Andy Serkis.
His real name is Na'alo Jar'uu He'ri but since he does not speak English and James Ford and his crew can not understand it, they gave him the name of Yali, which means "the other" in Greek.
He is a Purple Plasmata and more precisely a Kala.
He is a great warrior with phenomenal strength, very strong in close combat.