A Guardian from the ocean monuments in Minecraft! I think they are kind of cute! Especially their sounds when they are out of the water.
Well, the (funny) story behind this is that I was on our private server and I wanted to discover the new snapshot. I wanted to find the new polar bear mobs in snow biomes, but I found a ocean monument. So I left my boat and dived into the temple to farm some sponge, but when I swam up there was a guardian sitting in my boat! I took him home, made an aquarium for him and I called him "Spyke". Hell he's awesome.