Gylfaginning's checklist of Aesir is:
Odinn
Thor
Baldr
Njördr, Freyr and Freyja (not Aesir, but
listed)
Tyr
Bragi
Heimdallr
Hödr
Vidar
Váli (Áli)
Ullr
Forseti
Loki
Hönir, although brother of Odin, is not included.
Could he be a synonym of some of those gods above?