When Shiro and Keith of Team Voltron came to see the Blade of Marmora, Kolivan requiring them to leave when Keith brought with knife. At first Kolivan wanted that Keith raise the knife until he came to knowledge or death. But at last Keith had raised his knife and Kolivan came to see Allura and then Kolivan and the Blade of Marmora are now allies of Team Voltron.
Kolivan, like his society, is highly secretive and bordering on paranoid. He takes a long time to trust strangers outside his group of rebels, as shown by his initial unwillingness to cooperate with Shiro and Keith.
He remains calm under pressure and rarely loses his composure.
Much like his fellow Blades, Kolivan is highly skilled in combat, both with and without his signature weapon, which resembles a sword. Aside from this, he's shown to be an excellent leader and tactician.