Ultimoo said:
How often can you do this?
Costs 1 bar to do a tandem attack, and you can do literally anything you want. Have your partner jump a bunch of times, do a bunch of ABC loops, combo into supers, etc. Lockdown, unblockables, infinites, whatever. You can build up to 9 bars and it's pretty much the main use of meter for characters that have access to it. Plus, you also have Stand attacks which would be the equivalent to assists in say marvel, but you do them with motions like special moves and generally have a bunch of them. It's not a team game, each character has a Stand ability, which is the equivalent of a series of assists as well as a second stance. Think Street Fighter 4's Gen plus BlazBlu's Carl. And that's basically how every character in the game is. It winds up playing like a super execution-heavy, trap oriented Darkstalkers.
Plus, when the screen pauses for Tandem attacks, the animations look really cool.
Not to mention the smoothest walking animations ever.