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Some things to think about when building/describing a character:
Physical traits
Hair: color and length. Maybe it's natural, maybe it's dyed
Build: height, weight, muscle
Face: maybe they have a longer nose or forehead. Think about specific features like freckles, gapped teeth, jaw shape, acne scars, lip shape
Eyes: eye color, shape,
Backstory
Where is your character from?
Do they have family? How has that affected their personality?
What are their goals?
What are their likes/dislikes?
Strengths and weaknesses
Age
Personality
Voice: is their voice deep? Lilted? Strained?
How do they react to stressful situations?
What do they wear?
Are they kind? Meaner? Restrained?
How do they move? If they're older maybe they're a bit slower. Maybe your character is clumsy or move awkwardly
Body language/face: is your character normally more serious? Do they have RBF? Maybe they smile more or their face is more relaxed at rest. Maybe they leave their hands on their hips a lot, or prefer them crossed or in their pockets.
How are they perceived by others? How do they view the people around them?
Should I dive deeper on some of these?