Annette is a new unit introduced in Metal Slug Attack.
A mutant inventress, she's Odette's older sister. She's both impulsive and impatient, as she wants results quickly and because of her busy schedule, is unable to linger around for prolonged periods of time. The Vanguard Type-A was created for her.
She has a very good bond with Odette, due to the fact that they are sisters. Annette reminds Odette about what to do, such as going over schedules and giving her as much encouragement as possible to ensure she completes her tasks. This bond is kept secret from the higher echelons of the Invaders, as she feels that her treatment of Odette leans more towards a spoiling side.
First appearing in the Extra Ops "Signs of Curse", she confronts a cursed Ptolemaios with his Special Forces soldiers. At the conclusion of this Extra Ops, she defeats him and his soldiers, just as Odette arrives on the scene.
Annette first appears in the story titled "What I Need to be Myself", where she responds to Odette's distress call. Before the Rebel Army can experiment on her, Annette attacks and rescues her, though she quickly realizes that the Odette in front of her is Nowan. Allen Jr. deploys the Emain Macha twins to stop her, but she destroys them with ease. The two later rush to the building Odette is in before leaving Earth for the Invader homeworld.
When Nowan asks Annette how she was easily able to discern him from Odette, she tells him that there was something small, but special that he lacked.