You can find here all the leaflets of the LEGO Minifigures Collectible Series, in a kind of Minifigures Series Guide.
Collectible Minifigure Series Guide
The Minifigure Collector: Lego Minifigure Series 1 -19, Ninjago Movie, Batman Movie Series 1 and 2, Lego Movie, Simpson, Disney, Harry Potter, DC Superheroes - Checklists and Visual Guides
LEGO Collectable Minifigures
LEGO Collectible Minifigures 71026 DC Super Heroes Feel Guide [Review] - The Brothers Brick
LEGO Collectible Minifigures 71027 Series 20 Feel Guide
Space Minifigure guide : r/lego
Guide to feeling for LEGO Minifigs Series 10
LEGO Series 23 Collectible Minifigure Smart Feel Guide
The Minifigure Collector: Lego Minifigure Series 1 -19, Ninjago Movie, Batman Movie Series 1 and 2, Lego Movie, Simpson, Disney, Harry Potter, DC Superheroes - Checklists and Visual Guides
LEGO Marvel Minifigures Series 2 Weight Guide, and correcting other identification myths - Jay's Brick Blog
Review: LEGO Minifigures Series 24 - Jay's Brick Blog
Review: LEGO Minifigures Series 25 - Jay's Brick Blog