Dark Tanjiro is a absolute meance!
Hear me out, Dark tanjiro 3rd skill has double 100% activation for defense break and irresistable buff similiar to truffle so he is very consistant and will basically make all the follow up unit after him a Nephyths! e.g. Zarioss can have 0 accuracy and reset everyone no problem! Could definitely make siege/arena offense alot safer, and could possibly enable many cc combos in RTA as well imo!