Derek Generic.
Derek Generic is Bobby's 10-year-old brother, with a rat-tail hairdo and a sarcastic manner. He absolutely loves horror movies and skateboarding. He always calls Bobby names, such as "Dork," "Pea-brain", and "Dweeb," (voiced by Kevin Smets seasons 1-5 ,Pamela Segall season 6-7 and Zachary Gordons in Bobby's World 2.)
Bobby's bad habit is that he keeps listening to Derek's lies and cruel jokes and Bobby doesn't learn his lesson and needs to stop listening to Derek.
Derek was supposed to be his swimming buddy; however, he ditches Bobby so he can go to the pool.
As mentioned in "The Revenger of Dr. Noo", he was kicked out of the Scout Rangers.
Also reveals that in "The night of Living Pumpinks" A "Big Dummy" Picks on everyone, revealing that he is not the Exception, This not the first time that He is a bully magnet.in the revival, Eric (Mr gengic's Nasty Teenage GrandSon) loves to torture him and Bobby
He May have a slight crush on Bennether (Natelie's Younger Cousin)