I don't know anything about the two fandoms involved and I think you did a good job of showing what was wrong in this fic, while at the same time recognising that some parts of the canons are a bit silly.

If I might offer some concrit, though, I thought that the mission lost some momentum during the card duels. A lot of it was someone using a non-canonical card or using a card in the wrong way and the agents complaining about and saying how it was supposed to work. I felt that some of it could have been abridged. Alternately, I would have liked to see more actual effects and jokes from the non-canonical cards, like with 'Rose in Bloom', which I thought was great!

The agent banter was funny and well written and chocolate-intoxicated Riaa was a nice surprise. I did not see it coming and it was fun to watch her like that.