So what actually counts as a Fiend or a Celestial? I mean in the wider sense, not the narrow Exemplars-only sense.
1. Any outsider native to the Outer Planes of a G or E alignment?
2. Any outsider native to one of the Upper or Lower planes, regardless of alignment?
3. Has to be G outsider from Upper Planes or E outsider from Lower Planes?
4. Some more narrow definition?
I mean there are lots of planar creatures, many of which don't seem to have been designed for Planescape, that are Evil or Good but I don't know how many are considered Fiends or Celestials, or if there are even solid definitions of those terms.
Rakshasas, for instance. Are they fiends?
I've seen 3E conversions of Bariaurs that make them Outsiders. Are they supposed to be Celestials then? That seems weird.