making bosses better, how could it be done?

We need more bosses like Pierre. I like that it's a boss that makes you think, but it doesn't have damage reflect or over the top damage/HP/defense ect.

It's the only maple boss i've actually had FUN fighting (you know, except for the flames causing a load of lag, has that been fixed yet?). I really want to fight it again now that my Kanna has hyper skills.