I don't think I've seen anyone talk about this, but clock me if I'm just retarded.
It seems that Niji's continuing their gameplan of further pushing their Vtubers as "virtual actors/seiyuus" of sorts, as they released a new musical unit called Sepiast, consisting of original male characters voiced by already existing NijiJP girls.
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List of talent involved includes Higuchi Kaede (Shu [not the EN one]), Shizuka Rin (Ren), Yuuhi Riri (Tobari), Inui Toko (Mio), Nui Sociere (Yui), Fumi (Ten), and Shirayuki Tomoe (Yukari). Just like in the case of the Kodansha collaboration (Lie:verse Liars), the character designs also share some resemblance to the original girls.