Frisk

Frisk is a species of monster in the Underground. They appear as a unique enemy in Waterfall, residents of Frisk Village, and the vendor of Fris Shop

Personality
All Frisks share an erratic manner of speech, where they often exclude letters, mix lower and upper cases, make inconsistencies, etc. There are some exceptions, however; Joe always speaks in perfect English, the Frisk Shopkeeper will speak in fluent English when the protagonist denies to sell an item she wants, and regular Frisk in-battle will speak in somewhat proper English when denied Frisko Flakes.