The current funding goal is a barebones amount to get the game finished for the PC. If we're able to surpass it, we may be able to extend the functionality to other platforms. We don't want to promise anything we can't keep though, so until this happens, assume it will only be out for the PC.
The difference between the Annoying Follower and Fancy Noble tiers is your ability to customize.
With the Annoying Follower tier, we'll have a bust and sprite generator that we want to make available to backers so you can customize your character.
For the Fancy Noble tier, eDeus and Amicable will be illustrating your character directly according to references, whether its by picture (preferred), description or a combination of both. It doesn't have to be you yourself, it can be a character of your choice providing it doesn't require someone elses permission to use (we don't want to get sued to high hell for using a character we don't own).
For the role of your NPC, you can suggest what you would like them to do in the game. As development of the game progresses, we will contact everyone while making the NPCs in the game to offer roles as they open up. So for example, we have a town occupied by soldiers, we will ask backers in order if they would like that role, or not.
Don't see the answer to your question? Ask the project creator directly.