The Kikka was a prototype that never would have made production because Japanese industry was so far gone at that point in the war they could barely keep piston-engined planes from falling out of the sky.
P-80 is a post-war plane. It never saw any action in WW2, because it was too precious. They had a scarce amount of them and didn't want to lose one, so even though they MIGHT have made it into the closing months of the war (after all the fighting was done) they weren't allowed to.
The "devil's broomstick" was a rocket fighter design that was destroyed and scrapped after it developed oscilations at high speeds and killed a couple of test pilots in a row. It probably never saw action, and I wouldn't go believing Ubisoft when they produce a what-if hypothetical mission set (they mention this is a "what-if" in the readme).
None of these saw the war. The only one that came close was the P-80, but it didn't.
