Madeline and badeline

In Chapter 2, Badeline describes herself as Madeline's "pragmatic" side. Madeline states in Chapter 6 that she is paranoid, controlling, and cruel. Badeline is sarcastic and her anger is often provoked during the storyline before she and Madeline make amends. This is seen at the beginning of Chapter 6, when Madeline is nearing the top of the mountain.

Badeline seems to be the insecure part of Madeline, embodying, among other things, her fears: loneliness, inadequacy, failure, hopelessness, etc. She thinks in a more logical way rather than following her heart like Madeline is seen to do throughout the story. Badeline hates being incriminated, and this provokes her anger in the Mirror temple. She believes in dealing with her problems beforehand rather than making mistakes and sorting them out later. Badeline is a powerful magical entity, capable of breaking through multiple feet of hard rock when in an excited or depressed state.

Madeline is a short, young Canadian woman with pale skin, brown eyes, and long thick burnt orange hair with one wayward curl. Throughout the events of the game, she wears an aqua snow jacket, dark grey pants, black and dark grey walking boots, and her brown climbing backpack equipped with a red sleeping mat and plastic water bottle. In her official art, she is shown reaching for a strawberry with wings. According to Celeste's developers, Madeline is transgender.[1]

In Celeste Classic, Madeline appears considerably shorter, as well as having more cartoony proportions. In this version, she also has long red hair, pale skin, dark blue eyes, what is presumably a green snow jacket based on her design in the remake, and white boots.
Madeline is shown to be strong-willed and determined yet heavily conflicted, climbing the mountain to spite herself. Her courage is noted by other characters, some even berating her and calling her foolish, warning her to turn back before she gets herself hurt. Still, she presses on, determined to drive out unwanted thoughts from her own mind and take control of her life even when it's pointless and harmful.