The Maid

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

Tactics
The Maid prefers dealing physical damage, albeit occasionally deals lust damage instead. It's not possible to cause her 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.

There's unique story battle with one of the maids, to get info on the secret entrance; see this page for details.

Post-battle
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 abilities.