First, shouldn't Junko and Hecatia be higher on the list? They have transduality, so I saw someone say they should go up to the point where characters start interacting with them.
I'm not very good at analyzing fights, so I'll give my opinion.
9. Characters from Touhou (Junko and Hecatia)
From what I've seen of Touhou and Castlevania battles, they don't hax 4D or hax 4D resistance. As well as not having layered immortality/regeneration. So without transduality, I think they kind of die from the Castle's liabilities while Dracula is sitting on the throne.
8. Mori Dan
I think passives just screw him while Dracula is sitting on the throne.
7. Characters from Saint Seiya (Athena, Poseidon, and Eris)
I also don't see how they resist Castle passives, particularly things like Powernull 4D and Plot Manipulation.
6. Medea Pideth Machina (Web Novel)
This one I don't know exactly, Dracula has denial of immortality type 9 but I don't know if it affects her. She has this thing of immeasurable speed of attack and reaction, in addition to this thing of clones across the Multiverse. I just know that it doesn't resist Dracula's passives, mainly powernull 4D and Plot Manipulation.
I think her supporters have to look into this too.
----------------------------
From there come characters that either have a lot of skills or I don't know anything about them, or both (
and there's a Chinese character there, and I'm scared of him). So maybe it should be better to do vs threads.