What does the above OC have for breakfast!

I'd say a sugary cereal with a collectable toy inside. Or maybe a nice fruit bowl with a tiny bit of sugar on top c:

I had to google real quick if breakfast parfaits are a thing, because I can absolutely imagine that being Roxanne's favorite breakfast, though probably not every morning. Most mornings it's probably more a yogurt cup and some quickly scrambled eggs, but it is what it is.

Some pancakes with a heap of syrup on them.

I can see Lora having crêpes! One with eggs and veggies and then one with bananas and nutella!

I'm seeing...

A mix of all of the cereal in the house, and some canned alphabet soup...none of it is eaten. But after it's prepared, Random grabs a bagel and scarfs it down.

Grigorii might have two pancakes, and a platter of cheese and smoked "meats".

Probably a turkey leg and some grits.

3 pots of coffee and a cheese ham burrito with a fried egg 

Being a cook, the last thing Heechul wants to do is cook breakfast, so I'd imagine he'd have something quick and easy, like cereal or toast.

I'd go safe and say porridge, with possibly a boiled egg and some bread on the side. Breakfast is plentiful but nothing fancy.