Shyren is the Rolereverse version of Temmie.
All Shyrens share an erratic manner of speech, where they often exclude letters, mix lower and upper cases, make inconsistencies, etc. There are some exceptions, however; Billy always speaks in perfect English, the Shyren Shopkeeper will speak in fluent English when the protagonist denies to sell an item she wants, and regular Shyrens in-battle will speak in somewhat proper English when denied Shyren Flakes.
All Shyrens except the Shyren Shopkeeper wear blue sweaters and have green hair and skin. The Shyren Shopkeeper wears a green and yellow sweater and has greyiah green hair.