While I think this is an interesting idea, there are also some potential issues with the idea.
Procne wrote:- witch looks like its victim - Looks like them how, exactly? Hair and hair color matches, or clothing matches? Hair would probably be simple enough, but clothing could be an issue. What would happen if the witch decided to unequip their current hat, and equip a new one?
- witch's presentation name is set to that of the victim's No issues here.
- victim's body disappears No issues here.
- people who had victim kinned / memorized now recognize the witch as the victim. Witch, however does not receive the kin list of the victim There would be some awkwardness here. Without receiving the victim's kin list, the witch would have no idea whom they were speaking to, which makes this, perhaps, entirely pointless and useless. See below for my thoughts.
- people who had both the victim and the witch kinned / memorized still have both names on their kin list but now both names lead to the same character - the witch. This would be an acceptable downside to this, provided scents also lead to the witch - an extra danger factor.
The question is should the witch in the skin retain the colours the victim had in other people's kin lists, thus retaining permissions on claims. Better not imo. Probably better not, or this could be easily abusable, though without also gaining the victims gate keys etc, not as abusable as it could be.
Thoughts: Without also getting the kin list, this more or less just gives a witch a method of obtaining "appearance gear". Obtaining the kin-list would make this an interesting infiltration tool.