Board Thread:Council of Arrowverse Wiki/@comment-9346948-20180216065020/@comment-24152851-20180224034437

It really depends on the creator, but split personalities aren't always separate beings. They sometimes represent the suppressed side of someone that has always been there but now has no restraint. Other times they pretty much are two minds sharing a body. For Killer Frost I'm not too sure where she falls, it would help if we saw inside Caitlin's mind.

For Samantha I'm leaning towards Xander, but I will withhold making a definite choice since I'm not up to date with Supergirl.