u/Kris-PUPPET-Dreemurr

Art by silent girl protagonist enjoyer

Johnny Silverhand - Same situation as V, you're dying due to the Relic, and a cure in the real life world isn't guaranteed, though there are slim chances you may find a cure, though it's doubtful.

Ryomen Sukuna - Same situation as Yuji, you have most control, most of the time, though there are times Sukuna will come out, you cannot control what he does, nor can anyone else.

The SOUL/Player - Same situation as Kris, you get control as long as you rip it out of your chest, also you get control in the night, other than that, and specific instances the Player will be controlling your body able to say whatever and do whatever.