Kakuzawa Kyouju

He is the son of Chief Kakuzawa and also a watered-down diclonius with smaller horns and no vectors in his mid-30's. When he and Kurama were younger, they both went to university together and it was Kakuzawa that originally got Kurama involved in the research on Diclonius. He ends up, coincidentally, being the lecturer for a course at the university in which Kouta and Yuka are enrolled.

(Source: Wikipedia)