Chelsea had pale skin, auburn hair (pink in the anime), and red eyes (pink in the anime). She wore a butterfly headphone accessory on her head. She wore a vocalist-like clothing consisting of a white long sleeve shirt with the collar tied with a red ribbon under a black vest a red checkered mini skirt, and black leather below-the-knee boots. She carried her Teigu, Gaea Foundation, wherever she went. She was almost always seen sucking on a lollipop.
Chelsea had a mischievous personality, but this may have been an act. She had a cold, calculating side which can often lead to her making a blunt (but accurate) analysis of a person or situation. In the end, she was shown to have good intentions and tried to help the Night Raid members to become more realistic, as she was shown to deeply care for them and didn't want to lose them like she lost her old team. She was shown to have a love for lollipops as her Teigu was filled with them and she was usually shown having one in her mouth.