Pokémon - Hard mode: Try that your comment is NOT 'le funny FBI/police' type of comment.

And yes, I checked, the dude isn't a cop. What do I win?

Why are they so hot? Well…

One is in a onesie, which is known to keep you quite warm. The area around them makes me think it may be a fairly high temperature.
Another has a doll that probably gives warm hugs all day.
Finally the last one is on a tropical island setting, nothing more to say.

Is it really that difficult to think on?
Now I must go and find why professors in Pokémon are so cool!