Hermione Granger

If Hermione Granger isn't your top pick in the 'Greatest Fantasy / Sci-Fi Sidekicks of All Time,' then you're probably still using a quill in a ballpoint world. Seriously, who else can ace a potions exam, outsmart a magical creature, and save your neck before breakfast? And let's not even start on the time-turner saga—fans are still losing sleep trying to figure out if they'd use it for extra study time or just to nap. Choosing any other sidekick over her? That’s like choosing a Muggle manual over a magic wand!