With PIXY, I believe they tried to have a story-line universe concept about the 3 of them being good and the other 3 being evil pixies, or fairies, with the debut song Wings.
But, I think Let Me Know was more grounded in reality about a girl knowing a guy she knew had a crush on her and wanted his confession-- lyrically. However, the MV visually says otherwise because of their outfits and background production sets-- so I guess it was kind of a witch concept?
With Addicted MV, they went with a witch concept and continued with Bewitched.
And, with Villain MV, they did the criminal concept and continued with Karma.
Disclaimer ~ These were just my wild assumptions from an outsider's perspective; so I am not sure if it was officially 100% true as far as their concepts.
Anyone else who has more knowledge, please feel free to add your input.
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Purple Kiss, Dreamcatcher
It's funny you said that because some YouTube reactors also said PK's debut song/MV Ponzona reminded them of a mix between DC and (G)-Idle in concept.
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And do you all know there is a girl group that has yet to debut called Witchers?
They have an official YouTube channel as well, but the latest uploaded video was about a year ago.
I personally cannot wait for their debut.