If I'm trying to make it a real meal whatever veg / seafood / meat I might have around. But my lazy addition is a spoonful of crunchy peanut butter (and usually some extra spice) makes it feel more nutritious creamier and kinda like satay.
Add some cilantro garlic soy and chili oil and that's a top tier 5 minute meal, I usually whip the sauce up while microwaving the noodles in a bowl, stir fry for 2 mins and done
You should try it! Personally, I don't find butter weird (I think it's just people don't think of it as an 'Asian' ingredient) but I was shocked by the mayo. But a couple of folks mentioned it, so I'm going to try!
And thanks for this post BTW, I'm a bachelor again for a week while my partner is away, so I'll defintely be cracking out the ramen. And now I can pretend I'm experimenting, rather than just being lazy!