What is the role and fate of Satan and the unrighteous in the last days?
Thanks for your question.
Right now, Satan's is the tempter and deceiver (Mark 1:13; 2 Cor.2:11; Rev.12:9).
According to Matthew 25:41 and Revelation 20:10-15 and 21:8, Satan and the unrighteous will all end up in the lake that burns with fire and brimstone, the second death.
I hope that answers your question.