I was watching aespa's choreo video for WDA and the thought popped in my head that Hikaru from Kep1er would absolutely murder this song and choreo Hikaru has been on my mind because I've found her performances for Killa to be super compelling.She is a VERY good dancer and a charismatic rapper + has really dynamic/dramatic facial expressions, I think her tone, delivery, and energy would both add contrast AND compliment the current lineup of aespa in a way that's quite fun for me to imagine.
Obviously this is all just speculative fanfic but are there any other idols who you think would do really well / add something new and interesting if added to another groups' lineup or a specific era from another group?