Right now, you can't really use Amiibos for much other than lining them up across your desk, hosting pretend battles of Smash Bros. when nobody is looking, or making a buttload of cash via ebay when a factory default comes off of the assembly line.
As far as game implementation goes, I'm pretty sure that Smash is the only game that actually utilizes the figurines just yet, allowing you to call some extra fighters into the brawl or swap customized combatants with friends. We know that Code Name S.T.E.A.M. will utilize the Fire Emblem Amiibo to unlock in-game characters and that future titles like Mario Party will offer some sort of functionality but, other than that, people are mostly buying them at the moment because they're a thing to collect.
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