You may be referring to a character concept (a "piece" of a larger portfolio) that emphasizes youthful, feminine features while celebrating gender-diverse identities. Modern Terminology
Many artists create "cute" or stylized representations within the trans and non-binary community, often using vibrant colors, anime-inspired aesthetics, or soft, "kawaii" visual themes.
It is worth noting that in many contemporary social and artistic circles, the term you used is often replaced by more inclusive or preferred language, such as:
Various digital series feature "cute," youthful trans-feminine protagonists navigating daily life and romance.