Necklace | JoJo's Bizarre Adventure | Jotaro Kujo Symbols

Jotaro Kujo (空条 承太郎 クージョー　ジョータロー Kūjō Jōtarō) is the protagonist of Part 3 and also appears as a major character in Parts 4-6. Jotaro is the third and most recurring JoJo of the JoJo's Bizarre Adventure series.

Jotaro is a delinquent who lives an ordinary life until the Joestar Family's old enemy, DIO, returns. Jotaro travels to Egypt in order to save his mother and stop the Vampire once and for all. Wielding the incredibly powerful Star Platinum, Jotaro is the first JoJo introduced with a Stand and is among the most well-known characters of the series. 

JoJo's Bizarre Adventure (ジョジョの奇妙な冒険, JoJo no Kimyō na Bōken), often shortened to JoJo or abbreviated as JJBA, is a shonen and seinen manga written and illustrated by Hirohiko Araki. JoJo's genre spans Action, Adventure, Supernatural, Thriller, Comedy, Tragedy, Mystery, Slice of Life, and Horror. (from JoJo's Bizarre Encyclopedia)

The nickname "JoJo" is an abbreviation of the name of the Joestar family protagonists (Jonathan, Joseph, Jotaro, Josuke, Jolyne, Johnny, Jodio) in each of the eight manga story arcs whose adventures it chronicles.