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Kiara is a tragic character, she's puts in the most effort, always gives 100% since debut and she has this deep genuine love for idol shit. With that and her tragic backstory you get the feeling she's actually the one who deserves to be in the spotlight the most, but that would be too easy. Hard work translating into success isn't a compelling story. What IS a compelling story however is Kiara as the underdog, most hated, least successful but trying the hardest. You root for her despite all odds, so every time something actually does go well for her, it feels way more impactful.
You could argue the same for Gura, least effort but by faaar the most successful partly due to factors outside of anyone's power, liek her unique and pleasant voice. You end up with compelling character arcs about imposter-syndrome, depression, people wanting to find some sort of skeleton in the perfect anime girl's closet etc.
It's what makes Hololive so interesting and what has them occupy the brain of 90% of this board at all times.