Trying to choose specific AI opponents is a futile exercise in frustration. Functionally, it seems like all available AI's are in a queue, and navigating left or right of the currently selected AI chooses the AI in that direction on the queue. If that new AI was already in the roster though, the current and new AI personalities switch slots and it becomes impossible in either slot to navigate further down the queue.

For example, I have Edgar in one slot, and Makeda in another slot. I navigate left on Edgar, and the result is that now Edgar is in the slot where Makeda was, and Makeda is in the slot I just clicked left on. I don't want edgar in my game, and I want Makeda. However it's now impossible to continue moving left in the queue while keeping Makeda. Selecting left in the slot where Edgar is now positioned, he simply swaps with Makeda again.

Further, the color, and symbol are associated with the slot rather than the AI. This is astonishingly backwards and creates confusion and frustration.

I'm floored that this design made it into the game. This is not rocket science. You've gotten it just fine in previous games.