Okay, so I've had this cutie for about a year now, and have FINALLY decided to work on em!

So, to start off, I kinda like the idea of them being a half-finished character. Like they were supposed to be the Main character BEFORE Bendy was created.
I'm thinking something along the lines of the creator of Sketch dying in a horrible car accident, and never getting to finish Them. Then, a good few months later, Henry is hired and creates Bendy.
Sketch is left to gather dust.

When the rooms start coming to life, Sketch is ecstatic at first.They're finally alive! They're so happy! Until everything begins to hurt however. I can imagine walking on very roughly sketched legs doesn't feel the greatest. They'd be in agony. Not to mention they probably can't see due to that ink. What are they supposed to be? Male? Female? They don't know.

Sketch would probably have some sort of resentment for Bendy as well.

That's really all I can think of right now! Sketch is still a really big W. I. P, so if you have any ideas, let me know!