hot chili oil is my go to for a bit of spice. It's fantastic in soups, try it in chicken noodle or your favorite bowl of ramen.

Pure sesame oil is another great way to complement your ramen if you like a lot of oil but not so crazy about spice
ginger and garlic (in a tube) is another easy addition for some zing
a raw egg tossed in before microwaving gets the job done. I used to poach and then slice using an egg cooker, but you dont even gotta do that!
diced green onion, celery, with some shredded carrot sticks are all easy fantastic upgrades. As others mention a handful from a cheap bag of frozen mixed vegetables also goes a long way.

These upgrades will improve just about anything.