In Shido's group there was a guy named Yamada- that got kicked out of bus, for not following Shido' ideals. And most of the sources said he is dead, but we didn't see that scene not in the manga, nor the anime. And I thought that maybe there could be a story of he's surviving, and maybe even his traming up with Takashi's group? I have a few sketches for it:
1. When he got kicked out, from the bus. The only thing he saw last- it's how his own classmates, now been brainwashed by Shido's speech, were laughing at him. "They" were surrounding him, he was paralyzed by fear, but he managed to fight it, and starts running. He ran through the hords of "They", streets, and alleys of buildings. But no matter, how fast he ran, "They" always were on his tail. And finally when hemanaged to run to somesort of shopping street, he saw a man with the panama hat. Have a strange feeling that he can help him, he starts yelling "Help! Help me!". The man noticed him, and then to have some chances to hide, he ran inside of one of the shops. It was a T-shirt shop, he hided behind the cashier table. He heard how "They" entered the shop, and starts spreading, and almost got to the place he hide. But then he heared how the door opened again, and then there were sound of loud grunts and heavy hits. When the sounds died down, he looked from the table- he noticed the same male he saw on the streets. He was standing on the knees and back to him, and around him were "They" dead bodies. He asked him: "Are you okay?" through his tears and snorting Yamada said: "Yes". The man looked to his left hand, and noticed a few bits on it: -"Damn it. They got me twice", he lovered his drenched in blood hammer to the ground, and drew up of his belt a pistol of TT model. He tossed it towards Yamada: -"There's three bullets on it. One for me, and you got two left. I hope you know, how to use it", Yamada understood what it was about, and took a pistol. He pointed to the males head, and before take a shot, he said: "Thank you", he pulled a trigger. After sometime, he covered the male's body with sheet, and puts panama hat on top. He made some quick change of cloth, and took the man's hammer and pistol with him.
2. He was scavenging for supplies for a long time. He was entering a lot of grocery stores, but because of the big hordes of zombies, he couldn't stay here for long. Then, when he entered the another one store, he noticed another group of people. He didn't knew who it was, what were they up to, and were they friends or foe? He tried to be quit, but his clumsiness, gave him away, The soup started to search for a source of the sound. And then Yamada had no other ideas, than give them a fight. He charged for a girl with Katana, but she took him down with a foot. The group surrounds him, but when they looked to each other's faces, he noticed them(one of them at least), he said: -"Wait, Takashi?". And Takashi's group recognized him too. When he told them his story, they let him to join his group, so he couldn't be alone anymore.
3. I hadn't figures something else yet. But this sketch has a story of his vengeance to Tsunoda. They somehow got him, and tied his hands down. When they got the information they wanted, they were about to let him go. But Yamada yelled: -"No! This son of a bitch will not come with us. And I'm not gonna let him go". Takashi asked: -"what do you mean? " and he answered: -"You know exactly what I mean". Rey said: "Please, don't do this". But with the void in his voice, he said: -"I have to. Just wait for me in the car, you don't have to participate, or see this". When they realized that he couldn't be persuaded, they went to the car. Tsunoda was souting to them, beg them to do not leave him with Yamada. And after that, Yamada drew up his pistol, and aimed it to Tsunoda's legs, he said: "let's see, how are you gonna run with it", he pulled a trigger twice. Then Tsunoda started to scream, out of his pain in the legs, Yamada was just walking away to the car, where the rest of them were waiting for him. And when they were driving by, "They" approached Tsunoda to his screams, they devoured him.
4. That's the last one. Yamada, Takashi, Saeko and Shizuka were in scouting for supplies, they split up. Sawko and Shizuka were looking for meds to Alice, she was having a cold. Takashi and Yamada were looking for motor oil, for car's engine. And while they both were alone, Takashi started a dialogue: "You know, I would like to talk to you about that guy". Yamada asked: -"What guy?".
"-The ones, whom you shoot the legs, Tsunoda. I think that was his name"
-"Ah, this guy. What's about him? "
-"I think you shouldn't have done it to him"
-"You kidding, right? This piece of shit, along with this fuckers, who joined up with Shido- throw me out of the bus to die. And they laughed, when they did so! "
-"I know, but still. You shouldn't had to low down to their level. We can't kill every person, we met"
-"Didn't you did the same thing, to a guy on gas station? "
-"Yeah, but this was a defence. You did it, for revenge"
-"Fine, what if instead of me- they kicked out Rei, or Kohta, right in front of your eyes. What would you do?
-"I don't know, man. I don't know"
-"Well, take you time and think about it. I'll wait outside"
While Yamada was standing outside for the others, he heard a familiar voice "Hey!". He looked around, and saw Tsunoda, but in a disfigured form: he was missing a left eye, his legs were drenched in blood the same way he shot him, he was having a bite mark all over kis neck and arms, and there was a big blood hole in his stomach, with the intestens on it. Yamada got shocked, but said: -"What the hell!". The "Tsunoda" said to him: -"Well, are you happy now? "
-"How did you survived? "They" killed you! "
-"They"? No, you are the one who killed me"
"Tsunoda" starts walk to him, Yamada drew up a pistol. He shouts: -"Don't come any closer!" By he smirked, and said: "Go on, kill me. It's so easy for you". Yamada yelled: "I said, don't come any closer!". And the mirage passed away. Instead of Tsunoda, was a zombie, who grabbed Yamada's shoulder. He starts to fight back, and he won a fight, by killing the thing, with his hammer. Then when the others of the group came, they drive off, on their car
The End...?