Bo is a monster from my MG wip Monster City. I know that technically he isn't a memorable character for many besides myself but I know that he has been seared into my mind. Bo (pronounced Bow as in Bow and Arrow) lives a life of hiding in my wip. Monster City is a place where monsters are rounded up and locked away to be used in forced labour. Monster City's real name is Monroe City but the nickname comes from the mayor's and the laws mistreatment of monsters.
Bo belongs to Jupiter and their connection allows him to be invisible. But Bo is so much more than a secondary character to Jupiter, the protagonist. He was abandoned at birth and raised by Jupiter's dad before laws changed and Bo had to hide to keep from being enslaved. Bo is a bright light in a hard world and he loves the only family he knows and is willing to help Jupiter find a way to prove monster's aren't evil but he won't let Jupiter get into extreme danger and can be the word of sense to this adventurous boy. But he is still a fun monster and can't stay completely out of trouble.
What draws me most is a part in the book that isn't even written yet. Where something happens that takes Bo to a dark place and proves that not only is no one perfect but everyone has a breaking point. Even when it means going against the beliefs of those you love.
All I will say is the video below with Tony Stark threatening the Mandarin is close enough to Bo's state later in the novel. It is quite a transformation from the kind monster he was at the beginning.
Monster City one sentence summary: Jupiter wants Monster City to be Monroe City again, but to do that he needs to prove a monster didn't murder a child decades ago.
P.S.: A monster than grow and shrink at will, is naturally awesome.