Thread:AdamGregory03/@comment-26458135-20150502143823/@comment-2092177-20150502150500

Those are all the connections I could come up with.
 * They both have rock hands (Hellboy's Right Arm of Doom and Garnet's gauntlets)
 * They both fight monsters, demons, and even their own kind on a regular basis.
 * They're both non-human protectors of humanity.
 * They're both considered to be shameless displays. Hellboy for not following his "end the world" destiny and Garnet for choosing to always be fused.
 * They're both part of a team. (The B.P.R.D. for Hellboy and the Crystal Gems for Garnet)
 * They both have extensive knowledge on their own cultures.
 * And they both have notable oddities involving their faces (Hellboy's filed down horns and Garnet's third eye).