Although i don't like pokemon very much, their abillity and creativity to place an attack is outstanding.
The battle and defence items you are planning could be "high interactive"! Example:
Member x has obtain a silver sword and he wants to attack member y. When this is done, the avatar of member y has visual damage, cracks in it or change color...depending of the nature of the attack (this attack-nature could be made visible in a small notification under the avatar in the same way the recycle hack is putting his notification in deleted, moved and changed topics for example). Member x could prevent this though by buying defence items. Or he is able to counter attack in a certain peroid of time.
I think this may be the beginning of a whole new sort of hacks to make a forum high interactive. The only limit is your imagination and programming skills.
