Transparent Objects in Blockbench

       Hello, I'm working on a mod that I call 'The Dreadscapes', and I want to add this cute little floating lantern-like mob called the 'Twirlipod' to lighten up the mood a little bit. And I'm trying to make it look like it has a little glowing texture around it. What i'm saying is, there's a smaller cube on on the inside that has his cute face on it. And the bigger cube on the outside is what im trying to make look transparent. Its supposed to kinda look like the slime texture.