Sirius

Sirius is a character of the MegaMan Star Force series, and appears as the secret boss of MegaMan Star Force 3. He is the controller of a black hole, and uses it to attack other planets and stars, sucking them up and adding them to his "collection". He comes off as rather condescending and childish due to his lack of concern as to what happens to said planets and how he views all others as beneath him. When he attacks Planet AM and Planet FM, the Satellite Admins and Cepheus turn to MegaMan for aid. At some point in time he also acquires a Mu Metal that belongs to Rogue.

Sirius also happens to have rebuilt copies of the other EM Beings throughout the game, and the player must defeat these copies in order to fully progress through to the Black Hole Server. The rebuilt forms are labeled with "R" at the end of their names, save for Apollo Flame. After defeating these forms scattered throughout the EM World, the satellites that pinpointed their location now generate image data for the player to battle. When Sirius is finally defeated, he gives MegaMan the Mu Metal (in order to force he and Rogue to "fight eternally") and transfers his powers to Meteor G out of spite, causing Crimson Dragon to eventually upgrade itself into Crimson Dragon SP.

Abilities

 * Super Armour: Sirius cannot flinch.
 * Status Guard: Sirius is immune to status ailments except for countering-induced paralysis.
 * Glass Barrier: The middle row of the battlefield is protected with regenerating, 1 HP glass barriers, which can be avoided through the use of two Area Eaters or one Double Eater.
 * Format Laser: Sirius fires a narrow yellow laser at the player from his wings, canceling any special panels, Barriers, and Auras that it comes into contact with.
 * Wing Assault: Sirius launches his wings, which then fly down different columns at random. They can be destroyed or dodged, but cannot be blocked.
 * Wing Formation: Sirius launches his wings, which then shuffle about the field, firing lasers in different formations, covering different portions of the player's row.
 * Satellite Blazer: Sirius floats up and fires a laser that will sweep the entire field, destroying every normal or cracked panel except those on his current row. This attack also hits the middle column twice, and Air Shoes are required to properly dodge this attack.

After defeating Apollo Flame
(After defeating Apollo Flame.)

MegaMan: We... won.

Omega-Xis: That was a close one.

MegaMan: I don't want to compliment him, but he sure was strong.

Omega-Xis: Yeah, I don't think that there is anyone stronger than that guy was.

??? (Sirius): That may be true... But it was his pride that made him such a difficult pawn for me to control.

Omega-Xis: Who is that!?

MegaMan: ...Sirius!?

??? (Sirius): Gahaha...

MegaMan: Show yourself!

??? (Sirius): Gahaha... Before that... I'd like to congratulate you, Mega Man. I was very interested in your profile data when I found it in Meteor G. Its analysis on your abilities was right on the mark. However... The trials ahead will push you to your limits. If you were to make it all the way to me... I would be most impressed. And I would be trilled to add you to my collection. ...But for now, adieu.

Trivia

 * Sirius eventually replaces Serenade.EXE in his role as the bonus superboss.
 * Sirius is presumably named after the star Sirius, also known as the "Dog Star."