How would a human-inhabitable(shirtsleeve) world in the shape

>>55101386
Well, the equator probably would be a lot colder so, I guess the Sahara would be a cold desert and the Fauna and Flora in the rainforests would be different (hell it might not even be a rainforest), it also depends if it would be tilted towards the sun in the same way earth is.

>>55101386
days/nights would be shorter, and you'd have a relatively bigger polar circle.

but on the whole not a lot would be different to an oblate spheroid planet.
sure the equator is somewhat closer to the star, but on the scale of a planets orbit such a distance is negligible and would make no meaningful difference to the planets climate. Weather would probably be a bit more energetic, with a steeper graduation from equatorial to polar regions and stronger corealus effect.

The atmosphere wouldn't even work on such a thing, would it?

>>55101869
nah, it would be fine.
The atmosphere would largely conform to the planets shape, its rotating with it and influenced by the same forces.