Gilly

Gilly is Janissary James' mother. She was a former Spartan 1.0 like Jan's father James James. Gilly appears to have been out of Jan's life and seems to have been hospitalized or institutionalized as a result of her SPARTAN training/operations.

Gilly (or, alternatively, Gillie) may be short for Gillian or it may be an oblique reference to a Ghillie (pronounced "Gilly") suit - a heavily camouflaged outfit which relies on actual leaves, twigs, etc. in addition to the standard asymmetrical patterns of a normal camouflaged military uniform. Ghillie suits are often worn by elite sniper elements in the military for maximum stealth and concealment.

Her and Jan break into the Crystal Security building in an attempt to seek revenge against the gangster Thin Kinkle for killing Jan's father James James. They're able to corner Kinkle and Monster Ann and in an attempt to be motherly and spare her daughter from having to kill, Gilly shot Kinkle and Monster Ann.

From the Janissary story showing how Monster Ann dies:

Thin: Hey, this must be your mom, babysitter. Thin: I knew you didn't get your looks from your dad! Jan: You bastard. (loads guns) Monster Ann: Take him... He'll pay the price for what he done. Thin: You trying to sell me out to save your skin, Ann?! Jan: Gladys? Gladys: We're here, kiddo. Jan: ...I don't know what to do. Monster Ann: Kill Thin... let Monster Ann go... I'll make it worth your while... Jan: I just... don't know. Gilly: Jan, this isn't who you are. Jan: (painfully) He...shot...him... He shot him like a dog! Gilly: Jim didn't want this for you. Thin: You're still not pulling the trigger, babysitter... Thin: A lot I could still teach you. You know it! Jan: What kind of daughter am I?! Gilly: The best, Jan. (crying) Thin: Heh. Gilly: Your father was so proud of you. Gilly: And he would never want you to turn into... one of us. Thin: Hey, hey, hey they're talking truth, babysitter. Jan: Shut up! Gilly: I've never been much of a mother for you, Jan. Gilly: I never got to bandage up a scraped knee, Gilly: never had to read you a story at bed time, Gilly: never had to brush your hair... (loads gun) but I can do this... Thin: No...! (gunshot) Monster Ann: Agh! (gunshot, both fall to the floor)