This is SirenMixV1 by DontPlanToStop on CivitAI (https://civitai.com/models/39245?modelVersionId=45853) mixed with a 0.5 weighted sum of hll4 and hll3, tuned for generating vtubers, including rosters of Hololive, Nijisanji, Vshojo and a number of indies and smaller companies, though it can still do non-vtuber generations as well.