Max is the third child (by six minutes) of Bart Allen and Cissie King-Jones. He is the twin brother of Jenni King-Jones-Allen.
Max was born June 12, 2017, six minutes after his twin sister Jenni.
Max has a hard time sitting still and is easily bored. He is incapable of not helping if he sees a person or animal in trouble--the majority stray animals brought home by the twins are a direct result of Max's desire to help. At the same time, he has reservations about becoming a superhero. He sometimes wonders if he has a choice, or if his fate was decided the first time he tapped into the Speed Force. When Max is bored or troubled, he reads. He reads when he's not bored or troubled, too--the only times Max is not impatient are when he is running, or reading.
The full extent of Max's powers is not yet known. His speed manifested an early age; as a result, he was running faster than acceptably normal by the time he was three years old. He is able to run at very high speeds, including over water (though this takes some practice). Like his father, Max has an eidetic memory and can remember everything he sees, hears and reads.
Max is very close to his twin sister Jenni. They both look up to their big sister Ick and are her self-proclaimed minions (though Max prefers the term henchmen). He is also close to his brother Bat, who he has dubbed his partner-in-crime. Or Shadow, depending on his mood.
Max's best friend is Jack Drake.
He is also close to his namesake, Max Mercury.
Max's PB is Elijah Wood.