In front of Lumi and Next to Panko in the far left, there's a bit of a gap where you could fit another small character (Yuri) overlapping a bit and posing or something. Lumi's waist is also a bit off-model, which leads many to believe it was hastily drawn in after removing Yuri.IDK if I'm blind or I just cant seem to find the gap you are talking about? where in the picture you feel the gap is?
Hey I don't remember was Yuri a good singer? I don't recall her singing much, but I could be wrong. I think she did a Super Idol cover?