The Butler

Brainwashed servants would attack any intruder with intent to capture them.

Encounter
"Options are shared between the two servants."

Victory aftermath
"Options are shared between the two servants."

Tactics
The Butler deals exclusively physical damage. Additionally, sometimes he uses "mysterious hand technique", which, while doing no damage, lowers your defence and attack for duration of combat. It's not possible to cause him any lust damage (probably due to brainwashing): instead, the context menu provides options which ends the combat immediately; however, each of them can only be used once per game, and would be disabled on subsequent encounters.

Note that if you're fighting them, you're already doing things wrong, as just following Pixie's instructions and wearing the enhanced clothes prevents them from attacking you in the first place.

Post-battle cenes
Defeat scenes:
 * Losing in battle with them would lead to a Bad End, though nothing would be shown to avoid spoiling the villain and their special abilities.