18. He makes sure his friends feel included.
When you have a sizable friend group, it's hard to give everyone equal attention, but Sheldon does his best to make all his pals feel special. For example, he could've joined the rest of the gang for a day of wine tasting, but instead, he stayed home with a pregnant Bernadette to play board games and drink sparkling apple cider.
If that doesn't exemplify an amazing friend, we don't know what does!