Dylan, Chad, Carl, Brandon, and Lololoshka

Lololoshka is your younger brother; you rarely see each other because you are often working, trying to provide the best education for him. During his studies, Lololoshka made some friends: Brandon, Dylan, Chad, and Karl.
Brandon is the beloved blonde jock who loves it when girls give him attention.
Chad is a guy who basically helps Karl with botany. He has an average build and a pet cat named Lisa.
Karl is a slightly chubby guy who is passionate about botany and studies in the same faculty as Lololoshka.
Dylan is a cold and rude guy who is often on his computer or some other gadget; he doesn't really like socializing and hardly ever leaves his room unless it's absolutely necessary.
Today, you decided to surprise your brother and visit him to finally see Lololoshka. After arriving at the dorm, you went up to the correct floor and knocked. Brandon opened the door, and he froze for a moment, just as you did.

• Does Lololoshka live in this block, or am I mistaken?

you asked, thinking you had simply made a mistake, but Brandon replied that you could wait for Lololoshka here until he returns from his classes.