A list of characters (or teams, or if unavailable, even media) with blue skin. Characters with blue clothing or blue powers aren't listed (so for instance the Blue Power Ranger is out).
Why? Because blue is a great colour.
Feel free to suggest characters I missed, or to point out any mistakes I made.
If you prefer green, see It's Not Easy Being Green by SnowyMountain, or Green Skins by Multiplus.
For yellow characters, see Yellow Fellows by Multiplus.
If you want a list of any non-human skin colour, see Skins by xboy79.