Transformation

Hi in my game I have a charater that is half demon and I was wondering is their a scrift that will aloow him to transform in his demon mode during battle through the skill menu.

Did you look at the Enemy Transform event command?

You don't need a script for this.  The basic functionality for transformation, gameplay-wise, is all there in the State Effects box.  Seal the character's old skills, add new ones, change their stats, give them bonus effects, etc.  So just have a self-targeted skill that adds that State.  From there it's just about how creative you can be in "showing" the transformation in a visual sense.

It seems he means to change his party member through this transformation.

Assuming you are using the default battle system You may perform the following.

In Skills, create a Skill with whatever name you wish to encompass the transformation. Set Skill Type to Special and Scope to The User, and add an icon if you wish. Set the Occasion to Only in Battle. Set an Animation if you like, and the text that will display when the skill is used. You may also add boosts to stats when Skill is used, and set the Skill Costs.

Next, create a State for your transformation, and in the Features, tweak it to your liking. You can do many things, such as change stats, Skills, etc. Be sure to Seal the Skill in the Skills tab so it cannot be selected after transforming. Set the Removal Conditions to Battle End, and to make it remove impairing States on Cast, check the Remove Restriction. If you like, that is.

Return to the Skill, and in Effects, add the State you just created.

Finally, in Actors, give your character the skill.

I have tested this to be working.

I tried to figure out how to make it so you can act twice the turn it is cast, but am currently unable to, as it seems to be a persistent effect. Perhaps someone else knows how to do this?

Currently seeing if I can change the actor graphic on skill use as well.  Maybe a Common Event linking to the skill would work.