Hi Master Sutek,
I love this sheet, congrats and thanks for sharing your work. Overall, layout, design and the main font seem excellent, and I will decidedly use this for my BoL online games. I'd rate it a solid 9 out of 10!
As possible improvements I'd suggest:
- For new players, it'd be handy to have the Hero Points Use cheat sheet somewhere in the sheet, maybe even as a tooltip if you don't want to redo the layout (although I am not sure that feature is available in Adobe Reader).
- After downloading it and playing with it a bit, I understand what you mention about the input font. It seems a bit too big perhaps, and does stand out a bit against the main font. But I am afraid I cannot suggest a better one, I am rather clueless on that end.
- Maybe again related to input font size, but Name field seems a bit small: if a player wants to add a surname or a region of origin the whole text is not displayed and that is a bit annoying.
- The big free-text box below is cool and comes handy to throw in there any misc info players may want to add. I like the idea! However I think it'd be useful to have a separator in that box, so players can arrange details in two columns or so, if needed. I am not sure if that is technically possible, but I have the feeling it'd help to get the most use out of the limited space, which can get easily filled with just a few lines.

But as stated, I am impressed and think this is definitively the best editable BoL sheet I have seen so far.
Cheers!