Rudy has a tendency to spill everyone's secrets (at least when he doesn't know it really important to keep them. Example: he outed his sister to Gavin.
During the Halloween Rudy dressed up as a girl to support Rain it didn't go as planned. He has dressed as a girl a few times since then and has gotten quite good at it.
Ruby developed a crush on Rain. He called her his exception. They broke up when it turned out Rain didn't like him back.