So my flat mate asked earlier about the ffxiv free trial. as was concidering giving the game a try. the question is as I already have the game downloaded on my ps4 would he be able to use that with his psn ID if he registered it on mogstation for a trial thingy.

and if he were to then upgrade would his psn id work on my ps4?

or would a pc trial work on my already installed pc client?

the other option was create a new character on my account but the issue there lies in that we wouldn't be able to use both characters at the same time.