Zero (Mega Man Zero)
I personally believe that Zero's fighting style resembles all EU Lightsaber forms, based on the fact that he's proven to be effective against multiple opponents (Shii-Cho), has an incredible dueling record against other weapon users (Makashi), has a fair amount of defensive skills and is sometimes shown capable of deflecting with his saber (akin to Soresu), is a very good acrobat (, is capable of using strength based attacks (Djem So), is very versatile as a whole (Niman) and capable of quickly overwhelming people offensively (Juyo, and maybe Vaapad given his connection to the Maverick Virus having a few similarities to how Vaapad worked for Windu)
However, if I had to pick, I'd say his primary form is Niman, secondary is Juyo, and his tertiary is either Shii-Cho or Ataru
His primary is Niman in my opinion because he is an extremely versatile fighter who has no real weaknesses to exploit as a duelist, and is very much a master of all akin to Exar Kun, who is capable in practically any situation. Additionally, he's very skilled at integrating his various powers and other weapons into his fighting style, namely his EX skills.
His secondary is Juyo because he is very dangerous as an offensive fighter, and capable of quickly cutting people physically comparable to himself to ribbons while they are practically helpless, with only a few characters being able to contend with him for extended periods.
His tertiary is likely either Shii Cho or Ataru. Shii Cho because he is highly capable against multiple opponents (some bosses are like that) or even entire armies. Ataru being due to Zero's skill in both hand-to-hand (Z-Knuckle) and his general competence as an acrobat
