You are not giving enough information for anyone to correctly answer that question but I'll do my best with what you gave me.
So, Zolou seems perfectly habitable to me at first glance. An atmosphere that's just 25% thicker than Earth's is not a big deal at all and if its composition is similar to that of Earth, it's probably also perfectly breathable too (because the amount of oxygen and other molecules in the atmosphere is actually very important and crucial). The hot and humid climate might be kind of a problem though, if it's comparable to something like the climate you would encounter at Earth's Ecuator in summer in the Amazone... Keep and eye, because hot, humid climates are very dangerous and way more dangerous and hard to survive long term than dry and hot climates because our sweat turns totally useless at cooling us down because of the hot humidity. 778
If we are talking about very humid 30-40°C that's quite a dangerous climate to deal with because without the ability to cool down, you can easily start suffering tachycardia, high blood pressure and eventually die from a heat stroke.
Now <PERSON>... That's way too little information to work with, like, it might or might not be habitable depending on a lot of factors like how cold, how dry, atmospheric composition, etc. But assuming it is just moderately cold and moderately dry in general, It might be an habitable place for humans to settle on as far as you don't go way to far from the equator since the poles would be way too cold considering the planet as a whole is moderately cold.
About Ahki, it would need to be quite a young planet and have a huge iron core to sustain a magnetic field that can protect the planet's atmosphere from solar radiation. So, assuming that's the case and that its atmosphere is breathable and stable, It should be totally habitable even if it's hotter than Zolou since it's dry and that makes things much easier for the reason I mentioned before when talking about Zolou. Keep in mind that it must have some water somewhere, at least subterranean for it to be considered habitable 778