Fastest Growing Twitter Account Niches?

I have massplanner, and I'm going to be using the follow/unfollow method for growing the account. I will be mass uploading pictures that will be scheduled for at least a year.

I'm not planning on using twitter for anything at the moment so I might as well be planning!

So I want this account to grow big so I can change the niche when I need to use this account for whatever method! I'm going to scrape the images from google as far as I know, thanks!

Adult is known for growing fast but the followers are not worth much.

Okay, that might be a good idea but I think I'd have to make sure none of the photos have nudity in them - If that's a problem?
I'm going to batch download photos

Cute animals.