Full Demon
When in her full demon form, a pair of dark maroon horns protrude from her head, and her eyes change to have red sclera with white irises and slit pupils; thin black streaks also appear across each eye. Her eyelashes become much longer and thicker, resembling butterfly wings.
Her fingers turn mostly black and become sharp and claw-like. She also gains a long black demonic tail with spikes and a triangular tip with a red heart on the center.
In order to block Adam's punch, Charlie's arm became large, dark red and demonic with light red markings and longer black fingers.
Charlie Morningstar (Demon) Visual References
Full body reference: Charlie Morningstar (Demon) — default
Expression reference: Charlie Morningstar (Demon) — expression1
Expression reference: Charlie Morningstar (Demon) — expression2