How about other stars? They should have planets (imagine TRAPPIST-1 with 7 "earths" orbiting it) Let the main sequence stars be teenaged to late middle-aged, protostars be babies to adolescent and giants, supergiants and hypergiants be the elderly. Stellar remnants like white dwarves, neutron stars and black holes should be skeletons, hearts or brains just floating around.

Oh, and the OBAFGKM stuff.
These are main sequence stars.
O are hot blue stars that live for a few million years before going supernova or hypernova.
B are blue-white stars that live for a few tens of millions of years before going supernova.
A are white stars that live for a few hundreds of millions of years before turning into white dwarves.
F are yellow-white stars that live for a few billion years before turning into white dwarves.
G are yellow stars that live for a few billion years to a few tens of billions of years before turning into white dwarves. The Sun is a G type star.
K are orange stars that live for a few tens or hundreds of billions of years before turning into white dwarves.
M are red stars that live for a few hundreds of billions of years to a few trillion years before turning into white dwarves.

Wolf-Rayet stars are huge stellar behemoths that blast off their outer layers and die in a few million years.
Luminous blue variables (LBVs) are huge stellar behemoths that blast off their outer layers and die in a few million years.

Brown dwarves are up to you. Gas giants are eastern dragons, ice giants are wyverns, terrestrial planets are western dragons, moons and asteroids are amphipteres, dwarf planets are lindworms.