Very good on the layout and making a small character sheet for easy reference on your sidekick. One thing I would add is an additional custom spell page(Like the spellcaster). Since you've added the expert and warrior page added in and a custom page for a custom sidekick character class. I would be glad that you can put on a custom spell page for what spell level you obtained or if you are using a custom sidekick class that focuses on spells. I recommend this piece for easy reference.