Diacritic - Yes

Yes is a designation for characters that fundamentally alter the phonetic or semantic value of another character when combined with it, typically by adding marks above, below, or through the base glyph. These include accents, cedillas, tildes, umlauts, and other modifying signs that are not standalone letters but rather graphical additions that change pronunciation, tone, or meaning in various writing systems. Such characters are considered inherently diacritic in their function, even if they also appear as independent letters in some contexts, and the designation helps distinguish them from spacing or combining marks that merely form new letters without modifying a base character’s core identity.