Aoi Kurenai
Mad Skillz
There was, in the movie, and guess what her fate was?I heard there was a female rider in Ryuki.
Ryoutarou gave back the pass because (at the time) they thought all Imagin were defeated and he didn't need to be Den-O anymore, nor was there any need for the Imagin to stay in the past, they had their own futures to return to. Remember, their bond had been weakening for quite a while now, which was the reason Ryoutarou needed to use Liner form.
But then they return in Climax Deka when it's discovered that there are still renegade Imagin running around.