What would be the best fish for a fish bowl with no heater, filter, or bubbler?

My answers would be a typical goldfish, they can live perfectly normally with no filter, just ensure that you change the water regularly. Although am no expert, when you go to the pet store to attain said pet, you will be given best advise then, I do offer a tip, as there is no filter, you will have to occasionally change the water, for oxygenation and cleanliness, when you do, don't fill just with cold water, as very cold conditions can be lethal, add a few cups of warm, also add a few drops of "water safe" this can help keep fishy safe from the chlorine they put in our drinking water :D

but to be short, I have a regular goldfish living in the conditions you describe to have perfectly healthily.

Nothing really.

Consider growing some plants in it and turning it into a decoration.

Even the tiniest goldfish need at least ten gallons each and bettas at least five minimum (Many other people say 10 as well, it is certainly better)

the only fish good for a bowel with no heating/filter or airation are plastic ones.

fish bowls are too small, you have to have a filter to take care of the waste in the water.

Any fish should be fine, as long as you clean the bowl often.

Only snails or aquatic plants. Nothing else will survive in your living Hell.

Insane is correct.

A dead one.