Mentor's body became a host for Strel of the Fraternity of Raptors in Realm of Kings: Imperial Guard #5, after which a female member of his race replaced him as a Superguardian. Since then, a male Mentor has appeared with the Imperial Guard, particular in Avengers (5th series). It is currently unknown whether this is the original Mentor freed from the Raptor amulet, or another doppelganger Superguardian.
If an Imperial Guardsman's specific race is not known, they are listed as Shi'ar since they are a part of the Shi'ar Empire. To differentiate between these and true Shi'ar, Lilandra and her people are referred to as Aerie.