I recall seeing an ad of bunch of teenagers playing Smash as their Amiibo characters, but I can't seem to find a way to actually do it.
I know I can play in a team with Amiibo and have it be controller by the CPU, but is it possible to control it myself?
Unfortunately, no you can't. Trust me, I just figured this out as well. They're like a pet, you can train them and battle other pets. I bought 5 today. It's like a Pokemon I can train it and everything. Until I log on and find out all I do is watch it fight and level up. You can't play as them, but you can fight beside them. But still, I just spent about $60, and the commercial on TV showed teens playing as their Amiibo, which is apparently wrong. So you can not be them.