69

Summary
69 was an antagonist in Planet of the Apes. He was a clone of Gage with a Michael Myers mask. As a clone, he had no noticeable differences from Gage. He worked with 27 to turn the others into apes, and they only managed to turn Hunter and Ariel. After their transformations were complete and were discovered by Liam and Isabelle, 69 explained that he injected them with plasma to turn them into apes. Liam proceeds to shoot him in the head, thus killing him.

Personality
Unlike 27, 69 doesn't seem to be sadistic in any way. He can be rough or creepy with others. We can say that he is shyer than 27, preferring to wear his Michael mask at any time it's available.

Trivia

 * Despite being dead, there is a chance that he will return.