Are you a fan of the Kombat games?
Pixel Art animations made for a newsgame called Science Combat for Superinteressante magazine, take a look at the characters, they are quite funny and original! 🙂
Polonium – Marie Curie
Pythagorean theorem – Pythagoras
Natural Selection – Charles Darwin

Wormhole – Stephen Hawking 
E=mc2 – Albert Einstein

Tesla Coil – Nikola Tesla 
Optiks – Isaac Newton