Yes, I did all of this!

What did Duanmu Mo, the cyborg of Shocker, do after being transported to the world of magical girls?
He transformed into a monster and stole the magical girl's transformation item, but after turning back into a human, he pretended to bump into her and showed her great care.
After the magical girl was defeated by the monster, he and the monster pressured the magical girl until she awakened a new form and then ran away.
He temporarily stands on the same side as the magical girls as their companions, and after gaining their trust, he suddenly betrays them and laughs, saying that he has finally achieved his goal.
……
He was first transported to the world of Kamen Riders and transformed into a monster. However, before the Shocker organization could finish brainwashing him, a group of Kamen Riders kicked the place apart, and he was swallowed up by the aftershocks of the battle.
Having arrived in an unfamiliar world, and seeing the magical girls and strange people appearing in the news, Duanmu Mo made a decision.
He needs to hide his identity and lie low, developing his skills discreetly... I guess so.
—At least that's what he believed until he was surrounded by a group of magical female warriors.