Both the Sephiroth amiibo and the Kazuya amiibo are part of the newest wave of Super Smash Bros. Ultimate line of amiibo figures. There's also amiibo for Pyra and Mythra coming sometime this year, although Nintendo hasn't yet announced the release dates for that pair. Sephiroth's popularity in gaming is undeniable. Go to any gaming-related forum or discord server and you'll find at least one username based on "Sephiroth" or his identity as the one-winged angel. Even his theme music is one of the most iconic in gaming. As far as amiibo go... these might be some of the best, ever? The Sephiroth amiibo alone is just extraordinary, but the Kazuya one also carries over that same attention to detail. But come on, we all know which of the two you're planning on getting!