You’re looking at Prizmatec Cosplay in one of the most impressive costumes we have seen in quite some time. You can see how it was made below, along with photos and videos of Thanos terrorizing convention-goers. Fortunately for them, he left his gauntlet at home.
Work in progress:
The hug of death:
“He said to hold this sign or be destroyed”:
Thanos can crossover into any world he pleases: