If you want to slice the power out of someone just censure them. Then they'll be cut down in front of everyone and they'll feel super embarrassed. It's the best way to slice them down without actually cutting them and getting arrested.
Once you censure them and they lose all their power, they'll be just another guy (がい). A normal guy with everything lost to him. HAHAHA!
Currently there are no similar looking kanji which exist in the WaniKani learning system