i didnt add Hans Stein bio here but basically he is Fräulein's muscle, her Bodyguard, he have superstrength but his mind only belongs to Katja.
Also a detailed description on Katja powers is she can enchant any person attracted to womans, by touching she can control them for a limited time, time that is exponentially potentiated by sexual intercourse (she can control the same person for years, only having sex with him/her only once)

 

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