Mfers is a collection of 10,021 stick-figure NFTs created by @sartoshi_nft. There are 10,000 randomly generated NFTs and 21 1 of 1 NFTs in the collection.
Sartoshi used his iconic "mfer" in memes on Twitter long before he introduced the Mfers generative collection. The idea came to him when he made his profile picture the iconic "mfer" character with an orange background and began to wonder "what if we all have a mfer inside of us?"
Mfers is a CC0 project, which means "no copyright reserved", so Mfers are essentially public domain and can be used by any person or entity in any way that they see fit.