I'm curious. What (primarily) are you looking for in a character generator? I typically create my characters (especially NPCs) by jotting down a few numbers on a notepad. Are you looking for something to make pretty characters, or something that will manage inventory, or something to manage spells known/memorized (this is the one task which is pretty tedious in my method)?
Not sure about others but the main draw of a character generator for me is the "all in one place" convenience of it. If I want my wizard to learn a cantrip, I don't want to have to check through the PHB, Elemental Evil players guide, and the sword coast adventurer's guide (plus whatever resources are added later) in order to find out what cantrips he can learn. Nor do I want to copy a full paragraph by hand.
I want it all in one single, easy to read list where I can add the full text of the spell to my character sheet with a single click.
Easy-to-use UI is vitally important and where existing products like fantasy grounds fail utterly ("click and drag the little book icon to see more options" How could a new user possibly know to do that? Why Do I have to initialize each class "pack" separately?
Oh god I'm buried under too many windows why does every button open a new window?)
* The main value add of the character generator I'm envisioning, relative to every other character generator out there, is that I would include a quick table at the bottom of your DPR vs. every AC in the game, and of the DPR of every to-hit from +0 to +20 against you.
While that might be nice to have, it's not really what I'm looking for and honestly feels a bit metagame-y. You could probably just post a table of that in the character-optimization forums and call it a day.
If what you want isn't too hard I could make one for you and throw it up on a web page*, but I cannot and will not do "pretty" character sheets with lots of formatting and borders and pictures, etc.
[TL;DR]
What about a searchable database that can be copy+pasted into an existing form-fillable PDF character sheet? The "compendium" tool from 4e was a great resource and would fulfill like 90% of what I want from a complete builder.