"Rosie", the ghost

"Rosie" is a small pink ghost/spirit, Tom met when he was 16, she has no memories of her life. 

Tom was the one to nick-name her "Rosie" because of her hue, he also concluded "Rosie" was a "she" because of her color and her behavior.

Tom goes on a quest with her to help her remember her life and maybe find her body back!

"Rosie" also has a crush on Tom, but Tom is too naive to realize it xD