‘Team Asuka’ refers to the team that believes Shinji is best suited to Asuka. This is in contrast to teams Rei and Misato and, unlike those two, this one is obviously correct.
Let’s get the facts straight, guys…the way the plot’s written heavily implies that Asuka and Shinji will become a couple at some point…I’m sorry it had to be said, but I don’t make the rules.
This is basically canon. At least for the original series. Anything besides the original continuity is a big question mark.
For example…and I am loath to admit this…Team Asuka fails in the Shinji Ikari Raising Project manga.
As can be gleamed from my subtle language, I am a loyal member of Team Asuka.