Biographys
Sigma: Sigma Is a Maverick created by Dr.Cain but he used to be a maverick hunter like Megaman and Zero. Long ago, before Zero knew Megaman, Sigma (the leader of Maverick HUNTERS) went to stop a red MAVERICK named Zero who destroyed a lot of Sigma's "people" It was a tough fight, and in the end, it seemed Zero was going to win. Suddenly, Zero got corrupted and Sigma was able to defeat him. Zero was studied by Dr.Cain later on, and eventually was made to be a Maverick Hunter as he is today. Sigma however, got corrupted and now leads many Mavericks. He gets defeated many times, but keeps coming back. Sigma is no longer even close to a Maverik Hunter, now he is a Maverick/Virus. In the beggining of his Maverick ways he was determined to destroy humans, now he also wants to kill Megaman and Zero. The Sigma Virus turns robots into Mavericks, but will he ever win?
Sigma's Forms
Zero: Zero was a Maverick, who was created by Dr.Wily. That's why in the game Megaman X4, whenever Zero get's that huge "migrain" it shows a W. He lost to Sigma and got turned into a Maverick Hunter. Later he and Megaman were best friends, or sometimes even mistaken as brothers. Zero dies in some Megaman games, in X1 he get's killed by Vile and later Megaman searches for his pieces. And in X5. In X6 there was a big plot about the Zero Nightmare (Nightmare Zero, picture below.) It really wasn't Zero, he comes back right after you kill Nightmare Zero, and repaired himself after X5. Without Zero, Megaman would have probably gotten killed in X1 in the beginning when facing Vile if Zero hadn't have saved him. Megaman faces Zero quite a few times. X2, X5 and a stupid reason in X6. In X2 however, if you got all of Zero's parts, he saves you again before fighting a fake Zero that Sigma created (picture below) otherwise you fight the real Zero.
Nightmare Zero
Dark Zero
Bass And Treble: Bass and Treble were seen in Megaman 7. (Bass is pronounced Bass as in the instrument.) Bass and Treble work for Dr.Wily, and he made Megaman believe that he was against Wily, just like Megaman. But, he betrayed Megaman. In Megaman 7 and Megaman 8, Bass and Treble fuse! Bass is also known as Forte, that's why you might here of a game called Rockman (Megaman) and Forte. Rockman and Forte is a video game for SNES. You get to pick who you want to start as. Anyway Bass and Treble are now enemies to Megaman and Rush. Bass is also a secret boss in Megaman Battle Network 1 and 2. (Secret Section) I really like how he looks (below)
Bass...hidden in Megaman EXE
Bass and Treble Fuse!