His character is an Inchling on this elite server. Tubbo is a famous Minecraft Twitch streamer who is a member of Origins SMP. Funnily enough, his origin on the server is that of a Bee.

In Origins SMP, Ph1LzA was an Elytrian, and Sneeg was an inchling. Hence, the inchling can sit on the elytrian's shoulder to fly anywhere. Both Minecraft streamers used this technique to fly together.