Gnarrk (voiced by Dee Bradley Baker) is a Neanderthal and an Honorary Titan from Titans North.
As a Neanderthal, and also because of his bad experiences with the modern world, Gnarrk has a limited educational horizon. He is however, quite adaptable and can rise to any challenge, especially where Kole is involved. It is apparent that he values Kole more than just a friend and partner (it is unclear whether this feeling is reciprocated on Kole's part), and therefore he gets quite jealous and overly protective if someone gets too close to her. Though he is capable of understanding English, his vocabulary is extremely limited, consisting only of the word "gnarrk". Still, Kole is able to understand and communicate with him perfectly.
Gnarrk possesses no superhuman abilities as such. As a neanderthal, however, he possesses a high level of physical strength and endurance. From his living in a hostile environment he is also a skilled tracker and survivalist, and proficient especially with blunt weapons. He usually enters combat with Kole crystallizing herself and thus acting as an instant - and nearly indestructible - weapon. He is also immune to effects of the harsh Siberian climate.