KEROTANI'S PROFILE

I want to find a way to lock the main character in my game so he can't be changed out. There is a plugin called Fixed battle members but I can't seem to get the commands to work. If you know how the plugin works as there isn't much information given in the help window I would love the help.
Also I think Yanfly has a plugin that lets your characters and monsters to move in combat so when you use a skill the character will run up and hit the target. I can't seem to figure out which one it is.

So this may be half a help me question and half dev question. I played WoW for a number of years, to my own determent. But one thing WoW was good for was showing me boss mechanics. So I have an idea but I'm unsure if it's good or something I can do. So my idea is to give the boss some kinda of passive that deals a stacking amount of damage each turn. Making the players have to kill off someone and bring them back in order to not lose. I'm playing around with Yanfly's Passive Mod but i'm unsure if I can make such a passive or if this is too unfriendly on the player. Any thoughts.

Is there anyway to have class level outside of character level? Also I need to play around with the system more but i'm guessing there is an easy way to change classes mid game. If someone can help me with that it would be a big help.