Yes, easily. Just set up a standard battle animation and go from there.. there's lots of good stuff on Google.

Here's Leviathan..

http://www.gamingw.net/content.php?id=35&cat=resource

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Lots of other summons on that site too. You'll just have to make the animations yourself (just like you can for weapons and magic). Animations tab in the Database, in case you don't know where that is.