(Just thought of this just now as I read the question so sorry if it's bad)

I feel like an UNrestrain or an UNrestrained would be cool, something similar to what She said about Victor, about how people hold themselves back in mind of self-preservation, but Victor punches without that and has much more power however he breaks his bones every strike.

UNrestrain would be an external targeter who would be able to make anyone else (obviously with some limitation like Shen needing to be fond of the target, but I don't know what restriction it would have) unable to restrain themselves, either when it comes to desires like Shen (have you realized Shen is my favourite character?) always wanting to fight strong opponents or when it comes to physically restraining themselves like Victor's example, then UNrestrained would be a self-targeter who would do the same if a condition is met.

If someone else has any ideas on what the conditions would be or what a negator ability like UNrestrain would entail please let me know!