Charles "Chachi" Arcola was a recurring and main character on the ABC-TV series Happy Days and then a main character on its' spinoff, ABC-TV's Joanie Loves Chachi. The part of Chachi was played on both TV shows by Scott Baio.
Chachi is Arthur "Fonzie" Fonzarelli's cousin. He was also drummer of Richie Cunningham's band. His hero is his cousin the Fonz. He wanted to be just like him and also is an excellent mechanic like his cousin. He also was an excellent musician. He also sees Howard and Marion Cunningham as his surrogate parents, just like his cousin. Chachi spent three seasons trying to pursue Joanie Cunningham and won her in season 7 in Hot Stuff. Chachi landed his dream to become a good musician and he did.