Rosa is a young attractive woman with shoulder length light hair. She appeared completely covered in cloak to hide herself. In her right thumb, Rosa has some kind of scar or mark.
Not much is known about her personality. She seemed to be a kind woman, willing to save Escanor after his family and kingdom turned against him.
She helped hide Escanor from death after their entire kingdom set out to kill him when he first awakened his power and accidentally hurt his brother. She tells him she is his ally and tearfully bids him farewell.
Rosa seems to be an ordinary human and does not possess any superhuman abilities.