If there are multiple endings, these are some I'd like to see:
A Good Ending: Sebastian defeats Ruvick and both Joseph and Kid survive.
An Okay Ending: Sebastian defeats Ruvick and only one of his partners survive.
A Mediocre Ending: Only Sebastian survives.
A Brutal Ending: Sebastian finds a way to manipulate The Keeper, Rebone Laura, and The Haunted into turning on Ruvick- and they devour him.
A Lobotomy Ending: Sebastian lobotomizes himself to cope with all of the horrors he witnesses. The game fades out to blackness as Sebastian slowly becomes a vegetable- and as The masses of The Haunted begin to swarm around him.
The Bad Ending: Sebastian fails and Ruvick turns him into a Haunted successfully.
And maybe a joke ending
If you really want to see Mary, you should just die. But you might be heading to a different place than Mary, James.