What if Kizaru's devil fruit awakening allowed him to time travel like the Flash or like basically going light speed and reversing time🤔 I know Toki's df allows time travel but just a theory🤷‍♂️

Maybe. But, of what use would it be for him? Perhaps he could enhance his Ken with the Pika Pika no Mi by fast forwarding, though. Like, he could see the future in 'a flash', but have it be slow enough for him. I guess, we have yet to see an awakened Logia in general, huh?

Let's say Akainu and Aokiji are confirmed awakened. If their df can change their surroundings into their elements to the point where the entire islands' climate has been permanently changed, I won't be surprised if Kizaru's awakening allows him to go faster than light

He IS light. Why would his awakening allow him to go faster than himself? That makes zero sense.

Let me rephrase that by going faster than light means basically time travel

Wouldn't it make more sense for his awakening to allow him to transform other things into pure light, kind of like Doffy, but stronger? Like I said, I don't see an advantage to one of the fastest characters in One Piec to time travel.

How does making other things into pure light work or even help him, when he can just create and construct with light.

How does time travel help him?

You can still counter Kizaru with observation haki even if he's the fastest character like for eg; Katakuri future sight. But if you're going faster than light you're basically unpredictable even for advanced observation haki users. Also time travel cancels future sight.

When was it said that time travel cancels Future Sight? I don't mind spoilers, I just truly want to know when it was said.

And yeah, you make a convincing point, but if he already moves so quickly that he gives Ken users tons of trouble, what's the point of time travel? The opponent still has to dodge a light speed attack, which is impossible, unless you're, like, a black hole or something. That said, can Kizaru damage other Logia users without his haki?