Poltergirl

Poltergirl is an adventure game full of mystery. A mystery that connects every member of the town, and in unraveling it, you will change the lives of everyone you meet. Half detective/ghost story and half about a downtrodden population of monsters living in the sewers, Poltergirl introduces a slew of interesting characters to get to know and love.

Take control of the Brother and Ghost Sister duo together in a stealthy adventure to find out why/how she died. Use her ghostly powers to avoid detection and listen in on the monsters patrolling the varied levels to find out what makes them tick. Use this information to befriend them by performing small tasks like finding something they've lost, making a sandwich or other small acts of kindness.

OR PURGE THE MONSTERS FROM YOUR TOWN WITH KNIFE IN HAND

...it's your choice, but expect repercussions for your actions. Every monster in the game can be befriended or killed, including bosses. And how you treat others will affect the games multiple endings.