With the sole exception of Krueger, all of Lucifer's minions cross the MEH at one point or another. Nick tries to trap Alex and Lina in Mexico by posing as a Fascist border guard, Scratch kills Krueger and later on tries to round up all the Jews in Hollywood High for a one-way trip to Hell, and Deuce razes Hollywood High in an attempt to off five of the six Cures.
Subverted in the Christmas episode. In the Alternate Universe where Alex doesn't exist, Lina is a member of a gang that the Mafia hired to kill Hollywood High's dean. Lina has no problem with mowing down even her former best friends while representing the gang for the hit. When she meets Alex, she doesn't recognize him and kills him. With his dying breath, he wishes everything was back to normal... and suddenly, Lina becomes the sympathetic Spanish student and Pretty Cure we all know and love.
What Do You Mean, It's Not for Kids?: There's more violence than in Pretty Cure Heavy Metal, and Lina herself is a regular sailor mouth outside of school, tossing around the F word and other vulgarities freely. Despite Word of God stating that there will be absolutely no sex scenes (though Lina is seen to watch porn tapes at least once; she just won't be watching sex scenes on camera), it seems as though he'll be pushing for an NC-17 rating for this series nevertheless. It'll just be the violence and extra-heavy profanity (all of which will be uncensored) that'll get it its NC-17.