Background Pony #F40D
deviantArt and Twitter link mutually
FurAffinity and Twitter accounts link to one another. Artist signs pictures with “KyotoLeopard”.
Derpibooru user 3-gon has draw3 as their registered artist tag, but has also been uploading with the tag artist:3-gon3gonart is their registered dA URL so as a proactive measure it could also be aliased.
Derpibooru user BetaVirus has nekomellow as their registered artist tag and URL for other sites, but has also been uploading with the tag artist:betavirus