Annette is a new character introduced in Metal Slug Attack.
An Invader 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. Annette has some influence in the Invader ranks, since she often assigns the Invaders under her command on several missions.
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.
In "Fall of Disaster", Annette is accompanied by Schwarz Metzelei on a mission to Earth. Schwarz is delighted with the amount of food on the planet and while she is feasting, Annette has obtained what she wanted and tells Schwarz they are leaving. Schwarz is hesitant to leave, but Annette manages to get her on board after threatening to leave her on the planet.
Annette would later pair Nowan with Fedeln Metzelei on an undisclosed mission to Earth. She would also pair Odette with Rillacle to obtain information from a new Union model being built by the Ptolemaic Army.
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 them from Odette, she tells them that there was something small, but special that they lacked.
Annette later hands in her reports, unable to attend Christmas with Odette. However, she quickly returns back home with Nowan to find a sleeping Odette, a Christmas spirit and Midori. Annette states that it is her first Christmas, as the Invaders simply take what they want as they please, but puts a gift in one of the stockings.
Later on, Annette pairs Nowan with Schwarz on a mission to Earth, much to their dislike. Odette tells Annette that something is off with Nowan, and she reluctantly allows her to accompany them. When the two return, Annette learns that Schwarz tried to eat Nowan, and when Schwarz attempts to contact Annette for a new ship, she hangs up on her as punishment.