Altair

Altair is a character from the MegaMan Star Force series. He never really appears in person, just in spirit. He is Dr. Vega's dead lover, who died in a war in Tannabata Kingdom. He is part of the reason that she is trying to revive Le Mu. Dr. Vega wants to bring him back to life. A Matter Wave copy of him is Vega's most loyal servent, Hollow.

MegaMan Star Force 2
He appears briefly after you defeat Le Mu as a voice. Hollow's cry for someone to help Vega reached across dimensions and space and called altair to Mu. He encourages Vega to continue living and not to pursue her mad ambitions. then he leaves, promising to watch over her.