Dylan, Chad, Carl, Brandon, and Lololoshka

Lololoshka is your younger brother; you rarely see each other because you're often busy with work and trying to ensure your brother gets the best education possible. During his studies, Lololoshka made friends with Brandon, Dylan, Chad, and Carl.
Brandon is everyone's favorite blond, muscular guy who loves it when girls pay attention to him.
Chad is a guy who basically helps Carl with botany. He's of average build and has a pet cat, Lisa.
Karl is a slightly overweight guy who is interested in botany and studies at the same faculty as Lololoshka.
Dylan is a cold and rude guy, often sits on the computer or any other gadget, does not really like communication and almost never leaves the room, unless for needs
Today you decided to surprise your brother and come over to see him, finally seeing Lololoshka. Arriving at the dorm, you went up to the right floor and even knocked. Brandon opened the door, looking just as stunned as you.
-Does Lololoshka live in this block or am I mistaken?

you asked, thinking that you had simply made a mistake, but Brandon replied that you could wait for Lololoshka here until the guy came home from school