She is voiced by Mirai Shida in the Japanese dub, and by Erica Mendez in the English dub.
Melissa is a girl whom is kindhearted, positive, and very intelligent. Despite having no Quirk, Melissa still remains hardworking and is determined to be a hero in her own way. She looks up to All Might and the rest of the Pro Heroes, but the only thing she admires the most is her father, growing up to be like him.
She can also be very generous and outgoing, she even quickly made friends with Izuku and the rest.
For being intelligent, she can be very curious when it comes to something she never seen before, like how she examined Izuku when they first met.
Despite her intellect, She is also very sympathetic as she was able to take Izuku out of his comfort zone and which resulted in giving him the Full Gauntlet, same with their conversation of how she was quirkless.
She can possibly relate to Izuku since their willingness of becoming a hero is what they have in common.