I imagine that, similar to Mufrad, Benedict and Tybalt Vout are both hybrids (human + tremorian). Benedict has a third eye, and while Tybalt doesn't have any physical differences, he has regeneration powers along with both of them having shapeshifting powers.
c2a NOTE: - The Vout Bros. father is a human while their mother is a Tremorian that is a bird person. While Benedict took more after their mother, Tybalt took more after their father, and the only reason Benedict looks so human is because of his aforementioned shapeshifting powers.
