iLvl on charachter list
 

Is there any addons that shows me my characters iLvl at the character list, without logging in?

That is not possible. Addons cannot access the in game data unless you are in the actual game world.

Too bad! Back to Notepad or Post-It's then :)

Why would you need it at that point ?

If it is so that you know which character you need to play next then any addon that stores a copy of the ilevel of each character when you play them should be a more automated way of what you are doing manually :) Try searching for ilvl or ilevel and see what pops up and looks interesting .. or stay with the old notepad route :)