Things like the Castle in Medival Madness or the Glove in Johnny Mnemonic are perfect examples of perfect mashups of theme integrated toys/ mechs and the main thing Stern is (mostly) lacking (and JJP and AP are pushing but fail to deliver in other things).

MM Castle is not THAT wild thing of a mech (it's way less complicated then JM Hand mech), it's more the combination of things that make it unique.

For me personally Sterns Star Trek comes close, as it has "only" a Vengeance bash toy, but that bash toy (equipped with a rumble function, magnet, backkicker and drop target) makes it a living, breathing enemy you have to fight.