JoJo

Rick is a nickname shared by each of the main protagonists of JoJo's Bizarre Adventure, derived from the recurrence of "Jo" in their names.

In the text of the manga it is used most frequently in reference to Jonathan and Joseph Joestar.

With the tentative exception of JoJolion's Josuke, each of the protagonists is also descended from the Joestar family; while all bear the Joestar birthmark.

Non-protagonists
Non-protagonists that may be considered "Ricks":
 * Ricky  Joestar I 
 *  Ricky Joestar II 

Origin
Araki admits that the idea for the name came from his neighborhood's local Jonathan's restaurant where he and his editor would often hold midnight meetings. The two decided the protagonist's first name would be Jonathan, and Araki, using Steven Spielberg's name as a reference, decided the last name should follow the same format, and thus Joestar was decided. Araki mentions that it was risky using this type of name, as using a foreign name for a main protagonist at the time was considered taboo.

Araki also admits that stories such as East of Eden and the TV series Roots inspired him to use a periodical style where the main character changes, but the story continues; although this was not a very Jump-style format for manga at the time.