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Lumi is Chinese rrat was caught
Jelly almost burst out laughing when Lumi was eating because her mouth opened up so wide, small mouths is a typical asian feature aside from the occasional islander jowel monster.
Lumi remarked that all of her features were just bigger than the rest, her nose in particular. Dizzy interjected with a "racial debuff" implying that as Asians most of their facial features are smaller and flatter. This are observable general traits.
This means that while the 3 of them are Asian, Lumi is not because she does not have the racial debuff. The only reasonable conclusion from this stream is that Lumi is not Asian, and definitely not Chinese.