Ekko

Ekko has a time machine! He calls it the Zero Drive (or Z-Drive), and after he activates it, as long as it stays on he can freely warp himself back in time to the moment when he turned it on, keeping all the memories of the previous timeline. Was that confusing? Just watch this. It will make it clear. He can also do some weird things involving phantom doubles of himself from other timelines, but that's not the important thing right now.

The important thing is, he will not hesitate to use the Z-drive to do the same few minutes over and over and over and over again until he gets it exactly right. He's a bit of a perfectionist. From the point of view of an outside observer who keeps getting rewound back in time and forgetting what just happened, this has the effect of Ekko somehow knowing EXACTLY what is going to happen and reacting accordingly as if he's rehearsed it.

It's kind of an infomod-y power, so indicate to me how you want to do play this with your characters and I will honor your decision:

1: Feel free to handwave aborted timelines and just assume that Ekko knows what is about to happen.
2: Actually thread out aborted timelines with me, so that I can see him earning this information.
3: Please do not mess with the time machine with my characters without prior consent.
4: [Insert your preference here]