As for your question, the series lacks a reptile, but it also lacks a slightly crazy old person who is wise but uses that to take advantage of everyone.
Considering giant tortoises and tuataras are both reptiles and can both live extremely long times, easily over 100 years, either would be a good choice for such a character. It would certainly provide a lot of comedy opportunities.
Giant tortoises are zoo staples, which is both an advantage and a disadvantage. Tuataras like to sunbathe and have a third “eye” (light-sensitive patch) on top of their heads that could provide for some interesting mechanics in the story.
Old man Kame is very cute, but I wonder what his true condition is.
Dog-man and guitar guy are fun. I look forward to seeing more of them in future chapters.
I don’t trust Leon, yet. And this chapter deepened my suspicions about him and his intentions. What is he protecting Sekka from? Is it in general or is he protecting Sekka from something specific? Why does Sekka see ghosts? Is he perhaps close to death himself? Or has Leon known all along that Sekka is weak against ghosts?
The next chapter is a flashback to Sekka’s childhood and his pet bird. It looks like it will be a poignant chapter, so you may want to prepare some facial tissues.
Next up is “Kemono Kingdom: Zoo” Chapter 4! I’m excited to see what baby Panda’s all about — Hee!
Tip to all: the TV show “Being Human” is lots of fun. I’m currently watching the American version of series on Hulu.