Mari has short orange hair light brown eyes. She has a typical build & height. She always has headphones around her neck.
She has a cheerful personality, which assist in her making friends easily. She likes excitement & music. She has an excellent hearing & enjoys the sounds of trains. She used to record the sound of trains with her friends before joining OJT.
They are old friends from school. She seems to have a crush on him since then.
Mari see her as a love rival and a friend, they have a positive relationship.