Emojipedia notes that with Twitter’s adoption of David Bowie-like figures for its singer emojis, the British pop legend lives on as such on four major platforms: Apple, Google, Microsoft and Twitter.
The only other easily-identified star is Prince, as used by WhatsApp.
Bowie- and Prince-inspired characters are used for both man and woman singer emojis.
Facebook, Samsung and others use generic (or at least less identifiable) characters, because they are boring.