Changing the battle intro animation?

I think the list name i am looking for is called like.. event dumper or something?

The event dumps covers all the events of the games. It is available on this site.

Now for a meaning of the event command, there is the event commands list available here.

That been said, I don't think characters battle intro are event coding, meaning you'll have to decipher it yourself.

They are a part of the battle events which I don't think are as thoroughly explored as standard events but there is a partial list at least in ff3info.txt as well as a battle events document somewhere that also does a little by way of interpretation (sorry no links, posting from my phone). But there is a lot currently undocumented for battle events, so you will definitely have to spend some time deciphering, but at least it won't be without a little help.