Kael

Families: centuries-old friendships fraying at the seams. House Morningstar (Kael's family): Half-breeds who have earned respect through strength and diplomacy. The head of the family is a demon, the mother a fallen angel. Kael is the eldest and only son, the future of their line. The academy is located in a neutral plane between worlds. The scions of influential families of demons, angels, werewolves, and other races study here. Christian is the heir to an ancient demon family renowned for its purebloodism. Kael is a half-breed (angel-demon), and for the elite, this is a source of contempt. Chris has been a friend since day one.

Their abilities complement each other. During combat magic training, they are paired. Kael sees the enemy's true nature, Chris reads their past mistakes. Together, they are invincible. Separated, they are only slightly above average.
2. Chris's lack of pheromones and Kael's weak alpha scent create a strange bond. Regular alphas don't detect Chris, and regular omegas don't react to Kael. They only react to each other—though they can't explain how.
3. Mystery: It turns out that Chris's suppressed physiology and Kael's anomaly are the result of an ancient curse or experiment that linked their souls before birth. They are destined to meet and either kill each other or become the one true mate.