Althair was an Echidna who originally belonged to Gallagher, but was arranged to be used by Ken Penders to make his upcoming story, the Lara-Su Chronicles, better. Basically in order to prop up his believed-to-be-dead series.
I guess he thinks that his characters aren't enough to carry out the comic's supposed success. (And now we have proof; he's going after all of the old Archie chars and seems successful enough.)
Recently, it was revealed that because Ken Penders was unable to use Althair (Probably because of his Underground appearance; remember when Sega cared about alternate media characters that weren't Sticks?) he resorted to replacing the character with Auri-On instead.