Mr. Snake's struggle to be and stay good become apparent in book 2, where instead of saving the 10,000 chickens imprisoned in Sunnyside, he eats them all. Once Mr. Wolf saves them from him, they all retreat back to their cages, unable to trust them.
In book 5, during the space mission, the gang's ship is blasted by Marmalade's laser, and Mr. Snake immediately seals off the command capsule from the loading bay, sending it adrift and crashing on the Moon... with Mr. Wolf still inside. He spends the rest of the issue wracked with guilt over leaving Mr. Wolf to die, not helped by how Mr. Shark and Legs react and Marmalade rubbing it in after they're captured.
After reuniting with Mr. Wolf, Mr. Snake tearfully confesses he really is jealous of his and Agent Fox's relationship and was only trying to save himself. Mr. Wolf refuses to let Mr. Snake feel bad about it, praising Mr. Snake for saving the others.
Mr. Wolf: You know what, Snake? I'm glad you locked me out. Mr. Snake: What? Mr. Wolf: Because when you locked me out, you saved the others. Sure, that might not exactly have been your reason for doing it. But it's a start. Isn't it? Mr. Snake:What's wrong with you, man? I'm no good. Why can't you see that?
In book 6, Legs primes an escape pod for the gang, but is captured by Marmalade. Even though Mr. Snake is eager to leave right away, Mr. Wolf refuses to leave until Legs is saved. One by one, each member of the gang is captured until it's only Mr. Wolf and Mr. Snake left, standing next to the escape pod. Realizing they'll be captured and killed if they stay any longer, Mr. Snake makes a tearful, impassioned plea for Mr. Wolf to escape with him.
Mr. Snake: Listen to me, Wolf... I'll admit it, part of me really does want to be a hero. It's true. Part of me really, really does. But you know what I've learned from following you on all these stupid missions? [...] I've learned I'm not a hero. I know you want me to be one... But I'm really, really not. I know you want to be a hero. And who knows — maybe you are. But I also think you're crazy. And I think, one day, you'll make just one too many stupid decisions and you will go and get yourself eaten by an alien. And, Wolf? I think that day is today. I've never had a friend before, Wolf. And even though I do call you an idiot kind of a lot... I know that you're the best friend I'll ever have. And I don't want to lose you. So... Please get in the escape pod with me.
After Mr. Wolf is captured, he's sure Mr. Snake will rise to the challenge and come save the gang, only for Marmalade to gleefully show him the escape pod blasting out of the station. In that moment, all of Mr. Wolf's convictions are broken.
Book 7 opens with Agent Fox arriving in the city with the rest of the International League of Heroes to rendezvous with Mr. Wolf and the gang, but the gang fails to appear due to being sent back in time. When ambushed by the aliens, Agent Fox performs a Heroic Sacrifice to buy the rest of the heroes time to escape. Thankfully, the gang manages to inadvertently reverse this when they return to the present.
In book 8, following some intense training sessions, Snake gets irritated with the International League of Heroes and accuses Agent Fox of seeing the gang as nothing more than "dirty crooks", and knowing nothing about what Wolf, Snake, and the rest have gone through. Fox retorts that they have, and goes over all the ways each Agent has suffered in their lives from being bullied and cast out until they became the very monsters the world saw them as. Fox got the worst of it; when she was young, her parents were murdered by hunters who saw foxes as nothing but tricky vermin to be exterminated.
While invading the alien ship, Agent Fox asks Mr. Wolf what his real name is. This gets him emotional; no one, not even his friends, has ever asked him his real name before.
In book 17, Ellen is crushed to death by Splaarghön. Wolf takes it especially hard, refusing to believe she is dead. And then there’s the utter shock at Shortfuse revealing that she’s the One
Also in the beginning flashback where Wolf’s father call his son stupid and tells him not to mess up. Wolf is clearly upset.
Before and when the Others begin to merge with the One, the B team asks if being merged means they won’t exist anymore. Zee says that they’ll be changed, and it’s ’kinda beautiful’. Milton even says his final goodbyes to Legs, much to the latter’s tears.
