Kids will have lots of fun folding this easy origami fish and drawing in its eyes and stripes. I doubt they need help at all, but if they do, it would be to collapse the paper into a triangle and fold the fins perfectly. To center the fins perfectly, first place one over the other without creasing. Then kind of roll it up or down till they’re centered, and crease when they are.
If this easy origami fish doesn’t satisfy you, you can try the more challenging origami fish. It’s not an angelfish like this one, but it leans towards more of the traditional fish figure. It’s not too hard, but definitely “showoffable”.