Need Some Help

For replacing Gogo, if you need magic learning like others and want to get rid of mimic it require some assembly work, it really depends how different from Gogo you want your character. There are checks in battle module for Gogo concerning magic learning and other things. Aside of this you could have him recruited in WoB and there would be no other difference but you need to make some event work, like a recruiting scenario and some events if you want display a custom dialogue.

As for your custom commands, I might try to do one or two, we'll see but I'm pretty busy so don't anticipate any result very soon.