The people of God on earth have 2 natures: an old sinful nature and a new holy eternal nature (The Holy Spirit). When Jesus returns, He will obliterate the temporary sinful nature in the believer, and only the new eternal nature will remain forever.
Unbelievers have only 1 nature: a sinful nature. Jesus has only 1 nature as well: a holy eternal nature.
Eph 4:22-23, Eph 2:10