Genie
Before Islam, Jinn have been feared or venerated by people. Some prayed to them, so they would protect the caravans. Others feared, the Jinn might cause sickness and storms. Especially when Jinn battle each other, storms would be caused. Jinn could become visible and invisible and turn into snakes. But despite their agile nature, they were similar to humans and a human could even be able to kill a Jinni in fight.