Anime: Welcome to the N.H.K.
Misaki also falls into the category of extremely nice, but out of realistic reasons.
At first it just seemed like she was helping Satou out of the goodness of her heart, which I personally wasn’t a big fan of.
But then we get to learn about the inner workings of her mind. And she becomes painfully realistic.
She is a good person, sure. She singlehandedly made Satou improve as a person and even made him sincerely care for his friends.
But it was initially a selfish act, so it kinda… well enough analyzing.
Misaki is just a friend worth having, a reliable person with unlimited patience, and the resolve to see her plans progress.