Who's here, in one glance
An overlapping stack of avatars with a +N counter for the rest. It lays out the Avatar children it is given, forces one size onto them so a stack never renders mixed, and rings each one in the page colour so the overlaps stay legible on any surface. Purely presentational, so it renders from a Server Component.
Overflow
Five avatars show by default; the rest collapse into the counter. Lower max to tighten the row, and the counter keeps the true remainder.
Sizes
The group speaks Avatar's own size vocabulary and clones it onto every child, sizing the counter circle to match.
Accessible naming
The root is a group, so pass aria-label to name the collection. The counter announces as "N more" by default; overflowLabel overrides it when the remainder deserves context.