Looks like this Remilia is not immune against holy symbols.

I can't believe this is actually the first time I see someone make this joke.

Except Remilia is quite casual at making the cross actually. (Explanation in the fighting games)

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Lick_King said:
Except Remilia is quite casual at making the cross actually. (Explanation in the fighting games)

Red the Nightless Castle and Scarlet Devil shaped like a cross.

Because of this, they have charisma of the highest class.