How to make Textures SHADELESS in Blender 2.8 Eevee - YouTube
materials - Is it possile to create a flat-color (shadeless) shader in Blender 2.83 that is also flat when in a reflection? - Blender Stack Exchange
If anyone else is missing the "shadeless" option in 2.80 and emission is not good enough, there's a shadeless group node in the material made by the Import Images as Planes add-on. :
Cycles, Shadeless Materials, and Baking - Blender Stack Exchange
Blender Cycles Toon Material Node Setup | NixArt
Blender hidden Shadeless material for Eevee and Cycles • Blender 3D Architect
Where Is Shadeless Material Option For Blender 2.8? - Blender Stack Exchange
Blender 2.8: How to create a shadeless material? • Blender 3D Architect
Where is the Shadeless Option in Blender 3 - Lighting and Rendering - Blender Artists Community
Blender Tutorial - Shadeless Materials in Cycles - YouTube