Max first appears walking on a road in a forest with his synth siblings and Leo. After they are startled by a fox in the woods, Leo asks everyone what their charge levels are, and Max's is at 70% while everyone is else is 30% or below. Leo takes Max with him to get water while instructing the others to set up camp. Max and Leo arrived at an empty camp and saw their synth siblings being taken away in a truck. They attempted to give chase, but ultimately the truck got too far away.
Leo is again with Max, who's doubting if they're actually a family because he was designed to be a way. Leo says his father is dead, and he sees Max not as a design, but as a brother. Just as Leo is about to enter Silas' place, he tells Max that is he says run, or if they discover Max's true nature, to run. After questioning Silas goes awry, Max watches as Leo holds a knife to Silas' throat and makes him tell what he knows about Mia. However, after this Silas elbows Leo back and beats him. Leo tells Max to run, hits Silas in the leg with a wrench, and then runs away himself. Leo takes an alternate route, however, and winds up trapped on a balcony passageway. He slides off over a railing and Max catches him, and leans heavily on Max as they walk away and Silas watches on. Max takes an unconscious Leo to an alleyway, where he rouses him and Leo's first thought is "we have to get our family back" and tries to get up, but Max says they need to take care of Leo first. Max takes Leo to a car yard, as Leo says something's been done to Mia, but Max simply tells him to save his energy. Police show up, and Leo urges Max that they need to go, and after some urging, Max obeys, but they leave behind a sleeping bag. The next day Leo is completely unconscious, and Max uses a bathroom socket to charge Leo.
Leo and Max break into a house, while Max says they need to keep looking for Mia, Leo says they should lie low and do an internet search. Leo then begins to drink, and Max asks why, Leo says "to help me forget", but Max says he cannot forget because is like this. Before he can do much more, the news shows a murder at Niska's brothel which alarms Leo. Leo and Max are at the scene, and Leo concludes that Niska murdered someone. They then meet up with Niska herself, and Max watches as Leo scolds her for taking a life, then as Leo and Niska argue about her leaving. After Niska leaves, Max and Leo return back to the house, and Leo goes to sleep while Max waits by the computer Leo set up to scan for a trace of the synths' unique programming. Max awakens Leo and informs him the search found something, which was a post from Mattie with Anita's root code.
Leo breaks into a car as Max asks whether Mia will be happy to see them as no one seems happy to see them. They begin driving to find Mia, but he says he has a plan to flush them out. He and Max are then at a diner, and Leo jokes that they're an old man, but Mattie appears and reveals herself as the poster. Max slips and asks if Mia is with her, which confuses her, Leo then shows her a picture of Mia/Anita
Max was created as a younger brother for Leo, and his personality reflects this. He is naive and according to Leo, "cannot take care of himself". He has very nearly revealed his sentience in front of others, something Leo would scold him for. Max also seemed to have a pessimistic streak as well, often thinking their siblings were dead and wondering if they were really family, something Leo would quickly shut down by saying their siblings were alive and they were family.
When reunited with his family, Max was seen smiling often. He loves his siblings very much, as he threw himself off a bridge to save Leo even though he would probably be destroyed. Like the other synths, he is protective of Leo.
David Elster - His maker/creator as a Synth.
Leo Elster - They look at each other as siblings/family members.
Mia - They look at each other as siblings/family members.
Fred - They look at each other as siblings/family members.
Niska - They look at each other as siblings/family members.