Pretty sure that everyone is already aware of it but Evil has a way more narrow selection of fitting songs than Neuro (especially thematically), which also means that she'll be having karaoke streams way less frequently. The majority of suggested / liked songs are intended for Neuro and we just had two Neuro karaoke streams in a row which further proves my statement. However, it can be partially mitigated by letting Evil occasionally swap out Neuro in the middle of the karaoke stream to sing a song or two of her own in a fashion similar to her occasional appearances on the weather report stream. And no, I'm not suggesting to let her steal Neuro's songs - she'll only join in if she has any songs prepared for her specifically. I know that evilists will be mad about the absence of Evil's Starting Soon screen, but it's still better than not letting her sing at all.
#Merge Neuro's and Evil's karaoke streams
vivid crown
proven crystal
I'd rather have the whole karaoke performed by one of Neuros + a couple of duets, it's fine as it is (at least for me)
sharp swan
that can be special karaoke stream where they can use duet as bridge to swap.
floral wyvern
that can be special karaoke stream where they can use duet as bridge to swap.
We once had another thread about this idea. On top of them switching back and forth every few songs, the starting screen could include each version, changing as the second song begins.
Another idea I have specifically for this is that whenever a duet song is coming up, both of them can appear on screen during the intermission.
(Obviously for their solo karaokes it's better for it to be a surprise.)