Err.. that tutorial basically says to use a monster (with its own battle charset animations) as a Hero, then switch it in at an appropriate time. It doesn't mean to set the summoned monsters as humans..

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Another way would be to use a battle animation for the monster's poses, which lets you break the 48 pixel / 3 frame limit. Of course, that would require actual "work", to which I'm rather opposed - but you might find something good online, or possibly you possess enough talent to make animations yourself.