Friends come easily to Blank Slate and I imagine that she'll have quite a few. She's a very laid back pony and generally makes an effort to get along with even the most agitating individuals. She's always open to new friends and often meets many different kinds of ponies since she travels so much.
Don't darken my day...
Enemies are a bit harder for her to come by as Blank is a naturally friendly pony. However, they are possible. Anyone who looks down on her for her empty flank is a potential enemy, depending on how long they decide to keep the activity up.
[glow=white,2,500]Everything getsbright when you're around...[/glow]
Blank has never had a romantic attachment; she's never even had any flings during her travels. She wouldn't even know what to do if another pony approached her to express their feelings. Its something outside of her comfort zone but she's certainly opposed to it.
I can see these two being friendly to each other. Sprocket is a pretty flirty pony, so he'd probably startle Blank Slate a little with his mannerisms, but he'd definitely act like some sort of sibling to her. He'd be interested in how she doesn't have a cutie mark, too. The fact that she's laid back will help a lot, I think. They could totally balance each other out.
I actually posted on Sprocket's plot page before I saw you had posted here. XD Haha, you pretty much said the same thing I said. I'd love for them to have a friendship/sibling-esque relationship. She's laid back herself and having someone who just finds it interesting, and not weird, that she doesn't have a cutie mark would be a breath of fresh air for her. She's got a good sense of humor as well, so maybe they could both end up doing pranks together.
The Fun Has Been Doubled! is a My Little Pony: Friendship is Magic moderate-to-advanced forum roleplay. Set after the events of the fifth season, we currently have no overarching plot. Instead, we simply have created the world of Equestria for you as a giant playground to have fun in and to explore the magic of friendship. Canon characters and original characters are available for you to play as, both ponies and non-pony species alike! Just remember that we are account-per-character and we'll be fine!
So why don't you stay for a while, look around, and let us know if we should get a welcome party started for you.