"OdinFK" is one user that comes up over the years. He contributes large edits that stick, starting from 2008 up to now. He seems to add a level of expertise to the article.
"MercernaryBDU" is another large contributor, but mostly after the article was solidified. Worked on adding sections of information that clarified the competition.
Two users first created the article in 2005, but this version was mostly a summary of the Pro Tour matchups over the years.
Later in 2005, user "Kelly Martin" gutted the article and moved the information to another page. They then created the format that is generally how it appears now.
Also worth noting it looks like this article was worked on by another student in 2017.
Most of the edits over the past 5 years are edits being removed by people/bots for various reasons
Edits that stick are mostly new information being tacked on; movies, TV, video games.
For its first several years of existence, the article was just a summary of everywhere the character appears. Wasn't until 2012 that the article started to resemble a page that actually described who/what the character is. Format of 2012 is virtually the same today, aside from a couple other appearances he has made since then.