>>96800765
>>96800774
In CCC you even play as Elizabeth for a little while. And she is the boss with the most amount of fights, being the boss of like 3-4 chapters. She also has character developtment.
And yes, all the games, and even mangas except one that was about Tamamo, assume you picked Nero. She is the canon servant. She is also clearly the favourite of the developers when she got the best swimsuit and a bridal costume in CCC, and Tamamo got a normal swimsuit and bdsm costume.