The only double team is not Inyuyasha and Kagome - there are more combinations: Miroku & Sango, Inyuyasha & Sesshomaru, and Kikyo & Kagome. (This may not be all, but I only have 2 hidden Characters). To do this you must have a red aurora around you. It will flash for like 2 minutes, then it will go away (it is best to look at your partner when you do this!)
This is only for Inuyasha and Kagome. When you are fighting someone and InuYasha is flashing Red you press the circle button and it will combine InuYasha's and Kagome's attack together. This makes a Unified Ultimate Attack.
GamesRadar is the premiere source for everything that matters in the world of video games. Casual or core, console or handheld - whatever systems you own or whatever genres you love, GamesRadar is there to filter out what's worth your time and to help you get even more from your games. We deliver the best advice, the most in-depth features, expert reviews, and the essential guides for all the top games.