A remix of Juin's reply. I'm sorry, I had to take it further.
1. Shindou survives the zombie apocalypse as a ghost. He haunts Touya now. 2. Kuwabara - he is the reason behind the zombie apocalypse. 3. Ogata. Now he is the protagonist of the new franchise. He has to defeat his archnemesis Kuwabara and stop the apocalypse, so he survives. All of this while wearing a white suit. 4. Waya and Kaga. Yes. They are genre savvy. 5. Ochi, rebuilt by the secret Ki-in division as Ochibot to repel the invasion. Ochibot is indestructible.
Re: Five characters who definitely survived the zombie apocalypse
1. Shindou survives the zombie apocalypse as a ghost. He haunts Touya now.
2. Kuwabara - he is the reason behind the zombie apocalypse.
3. Ogata. Now he is the protagonist of the new franchise. He has to defeat his archnemesis Kuwabara and stop the apocalypse, so he survives. All of this while wearing a white suit.
4. Waya and Kaga. Yes. They are genre savvy.
5. Ochi, rebuilt by the secret Ki-in division as Ochibot to repel the invasion. Ochibot is indestructible.
Jim