Genetic type: Ancient Human
Love interests: Angelise Ikaruga Misurugi
Affiliation: Arzenal

Tusk is the man that lives alone on an island not so far from Arzenal. He is a descendant of "The Ancient People." These are people born before the invention of Mana and they oppose the "Mana Society." He is a knowledgeable mechanic, especially since he has a great enough skill to repair the AW-CBX007 (AG) Villkiss. It was he who found Ange along with the Villkiss lying on the shore and treated her injuries.

Later on the series it was introduced that Tusk is the former Knight of Villkiss, and that he has a past connection with Libertus, and Alektra, which is known as Jill.
He lost his parents in the war of the norma and the so-called God' Embryo. It is for this reason that Tusk decided to live alone leaving these past memories behind. It then changed when he met Ange on the island where he was staying. Later in the series, Tusk decided not to run away from his past and become Ange's Knight.
(Source: Cross Ange Wiki)