Walk-ins are angels who no longer have to be reincarnated, but they volunteer to take over for the soul of someone who wants to leave before his destined time. While the angels are here on earth in a human body they are "earth angels" with all the vices and desires of a human. BUT, they have a drive to fulfill their misson and improve humanity. Earth angels have a code of ethics that will not allow them to harm another living being unless it or he intentionally wishes to harm earth or its inhabitants.
All earth angels have their own guardian angels, angels who are not incarnate and assigned by the Creator (Ms. C) to protect the earth angel when he is trying to succeed in his earthly mission. However, even guardian angels can have their quirks.
Many times, the earth angels find themselves in direct conflict with demons, the troops of the Dark Prince, assigned to defeat the angels from their mission, and, thus, they succeed in winning one for the dark side. It could mean the demons also recruit more "minions" to serve them. The minions are those souls who are trapped or possessed by the demons when an earth angel fails in saving them.