>>13595926Rushia dropped nanodesu due to not liking 敬語 to refer to her viewers since she wanted a closer relationship and not wanting to do a character, not because it's hard to stick なのです on to end of sentences.
Acting like a samurai is actually rather easy to do to stick in character, ask Suisei. I doubt she'll be anywhere near as character as at debut, but definitely でござる and silly archaism are there to stay, it's as easy as replacing you with thou or something like that in English.