Bonjwa is a term used to describe a player who dominates the StarCraft scene for a long period of time. A bonjwa has a very high winning percentage and successive title wins. However, a bonjwa is not defined by his statistics or records. Rather, a general consensus is reached that he is the most dominant progamer of his era.
"Bonjwa" 본좌 in Korean was originally the self-raising first-person pronoun, used to distinguish oneself.
In StarCraft, the name "bonjwa" was first used as a nickname for July, even though he was not "a" bonjwa. As a term to name a particularly dominant player, it was established during the sAviOr era.
 Visual History
Below are graphs of the Glicko-2 ratings (an improvement on Elo) of each bonjwa during their respective careers.