Not my term! "Byokihime" is coined by @Muffetelle on X!

Byokihime means "Sickness Princess," used to refer to the trope of sickly, disabled (whether physically or mentally), and manipulative feminine characters that are also wealthy.

In order to be a sickness princess a character has to:

• Be rich / from a rich family
• Have some kind of life-altering illness or disability
• Be cunning or manipulative

The masculine equivalent of Byokihime is "Byokiouji".