Hi,
is there a character editor for Might and Magic 9 like the CHEs for 6, 7 and 8? Didn't find something that can edit all aspects of the characters like skills, level, attributes and so on.

Try this: https://www.cheathappens.com/2372-PC-Might-Magic-9-trainer
Note that this requires that you are able to alt-tab out and into the game, as it isn't a save game editor but rather a program that makes changes to your characters "on the fly", while you're playing.