Here's what's available:
Typical stuff, really. Except for one item -- the Phlegyas Pet. In the game, Phlegyas is a large, molten golem type creature that Dante rides through hell. As a pet, Phlegyas is an adorable little cutie-pie that just kind of hangs out with your Avatar. I've never purchase any Avatar items -- I think the whole thing is a bit silly. But I won't lie, this little guy is tempting.