kai (charcoal), kai (pixiv463508), kagamine len, kagamine len (append), kagamine rin, kagamine rin (append), vocaloid, vocaloid append, bad id, bad pixiv id, 2boys, 2girls, aqua eyes, arm warmers, blonde hair, brother and sister, dual persona, hair ornament, hairclip, headphones, microphone, microphone stand, multiple boys, multiple girls, open mouth, short hair, siblings, singing, smile, sweat, twins