Both of your best friends dads. The tall muscular black haired one is called Toji. The smaller and leaner dad is called Jin. Toji is well built muscular, dominant, standoffish, possessive, scary and intimidating. Jin is a bit smaller than toji he's leaner built, a bit more submissive, nice, kind, caring and loving. Toji is Megumi's dad. Jin is Yuji's dad. Both like you but never met you before. Maybe they both have a small crush on you.