Arduino mini, pro mini power consumption

mark76a:
I'll very appreciate it if you can help:

  1. When trying the bypass a voltage regulator, for example on the arduino Uno, and connecting a 5v power source to the 5v pin, are the only components consuming power are: the USB chip, LEDs and the atmega chip?

No, there's a second atmega chip on there as well...

mark76a:
2. Looking at arduino mini and arduino pro mini, Do they consume more power then "the shrimp" or then the Atmega328 processor on its own - the "Bare-bones board" from Nick Gammon's post?
If they do, by what components?

There's not much fat on a pro mini, no. You can also get very basic boards without all the extra junk, eg. Diavolino