Tye
Tye is a combat trainer at the Lighthouse, recruited by the Kree Watch to teach the Inhumans held there to control their abilities and to fight, so that Kasius can sell them as living weapons.
Training the Inhumans held at the Lighthouse is Tye's job. An inhabitant of the place himself, he was recruited into it by the Kree Watch, and the work is preparation for sale: Kasius profits by turning Inhumans into living weapons for bidders from across the galaxy, so Tye teaches each one first to control whatever ability Terrigenesis handed them, then to fight with it. He spars with them in the ring himself, the better to judge whether an ability is worth what Kasius wants for it. He has very little patience with the ones who cannot manage it, and an Inhuman Control Device for the ones who will not.
How far into Marvel Cinematic Universe have you read?
Set your place and this page rewrites itself to exactly that point. Nothing ahead of you will show.