Teach

Teach, also known as Oleg or All-Salyer Oleg, is a Hero in Xenoblade Chronicles 3. He is the commander of Colony Gamma

Appearance and personality
Teach has blondish-white hair, blue skin and pointed ears similar to an Indoline, and a blue diamond on his left cheek. Teach wears a purple Japanese themed coat with a white Japanese undershirt underneath, white armored armbands, black pants and sandals.

Going Beyond Power
Teach is first encountered during the Hero Quest Going Beyond Power. Walking up to them through a guard of honor made by the Gamma soldiers, he warmly welcomes Mio, Taion, Sena back in Colony Gamma, saluting them with a smile. He doesn't show hostility to the Kevesi members of the party, offering all of them to take the time to rest. But as he turns their back to them and walks away, his smile disappears, replaced by a serious expression.

The party takes the time to catch up with their old friends in Colony Gamma, before deciding to talk to Teach and explain him everything about Ouroboros and what happened since the mission at Alfeto Valley. Sensing the serious nature of their talk, Teach offers them to relocate to a more convenient location than the Commander's Office. They agree to meet up at the training grounds later to head there together, and the party leaves. Seemingly alone in the Commander's Office, Teach laments the fate of some of the best soldiers he has known, now traitors to Agnus. Glancing at Consul G hidden in the shadows, Teach promises to deal with them to protect the world.

Teach and the party leave the Colony to head for the Commander's "good place". On their way, Teach shows them how to climb up slippery sand slopes, and the party inherites the Traversal skill Scree Walking. They eventually reach their objective, the Transcendent Retreat. There, Mio tries to talk to Teach, but he interrupts her, revealing that he has known about Ouroboros from the beginning, and that he has lead the party to this place to eliminate them away from their old friends's eyes out of respect. He summons his Blade, forcing the party to fight him.

Mio tries to reach him and make him understand they aren't enemies of the world, and they only want to use a power they obtained by pure chance to make the world a better place and protect the lives in it. Eventually, Teach chooses to believe in them and to spare their lives. Disappointed, Consul G appears and transforms into Moebius to take care of Ouroboros himself. With Teach's support, the party defeats him, and heads back to the Colony, where Mio and Noah destroy the Flame Clock.

Teach reveals to the party he had to test them to make sure they weren't losing themselves in their newfound power, because himself knew someone who had. Mio asks him to join them on their travels, to see for himself what they are doing with the power of Ouroboros. Teach accepts, and becomes available as a Hero.

Teach's Teachers
To help Colony Gamma survive, Teach asks the party to train the young soldiers.

Other Appearances
Teach can be among the recruited Heroes to aid the party in the final battle against Z, declaring his intent to stamp out the evil at its source as he is summoned. After Z's defeat, Teach can be seen on the Agnian side as Aionios splits back into the two worlds it was created from.

As a boss

 * Inscrutable Teach (boss)

As an NPC
Teach can be found at Colony Gamma when not engaged as the party's Hero.