Backstory:

He only focuses on training to get stronger.

His part of the Triple Bridge, focus a lot on strength, since it is the only thing he thinks about.

Doesn't appear during a genocide route.

Encounter Text:

B: Guys look, someone new.

J: Oh, that's going to be fun.

C: Let's explain to them what is going to happen here.

B: Right.
B: So, this is the Triple Bridge.
B: Each bridge has a challenge made by one of us.

C: All you need to do is pick one and go for it.

[Rio picks Boromba's bridge]

B: Really?!
B: I mean... really?
B: Good pick, boy.
B: You look strong so this must not be a problem.
B: Good luck!