To clarify a bit more, the "gimmicks" refer to something special about the Beyblade that allows it to function in a different manner. In general, the gimmicks are not useful for battle, but are more for fun. However, these Beyblades do hold quite good parts.
Phantom Fox splits into two parts, one holding AR and the other holding the WD
Dark Leopard changes modes, a la Dranzer V2
Aero Knight has a large rotor, similar to trypio
Round Shell has a large rubber core. Refer to
http://beywiki.com/index.php?title=Round_Shell_MS
Magical Ape functions as a gyro
Samurai Changer, Bloody Devil, Shining God changes modes when hit.
Jiraiya has a bearing core. Refer to
http://beywiki.com/index.php?title=Jiraiya_MS
Slash Riger has wings that fold out.
I think we need to make this a new category/article on the wiki.
P.S.: On the Jiraiya article it said that the weight concentrated at the edges increased centrifugal force and thus spin rate. This isn't true =/ I've edited it.