So, I'm thinking of characters for the 27th century Valiants, and since they're an Avengers homage, I thought they needed a speedster. But, all the speedsters were Exiled in 2119.
Here's the thing, though. The Exile Worlds were selected for conditions that would test the supers exiled there. Atlas has six times Earth's gravity to test the super-strong folk who were exiled there. The speedsters were sent to a world stuck near the event horizon of a black hole. Time there is nearly frozen and only the strongest speedsters managed to survive more than a few days. Slow down to rest and you were stuck forever. A few of them teamed up and saved one young speedster, who became Rush of Ad Astra. His story needs to be told, because unlike most of the other kids there, he's got a tragic history.
Then we come to Hotstreak. A speedster villain in 2119, she was on the run from Delta Vee, in New York when the Exile spell was triggered. For weeks, she sped around the exile world the speedsters never bothered to name. She was nearly exhausted when she suddenly found herself back on the same New York street, buried in snow. Hotstreak was the last living Exile on the testing world and was returned to Earth when the spell broke. A few weeks had passed, for her, but about 600 years had passed on Earth, due to time dilation. Like some of the other Valiants in the 27th century, she's out of her own time, too.