Then there’s Greed helping him with his anorexia

It could be like spirited away

Why’s it gotta be animation?

It will be easier to portray characters when it’s cartoon

If it's animated, I can guarantee that a live action version movie will be made that would be so much worse than if the show started as live action

Animation for tying every theme together. Plus more extravagant or unreal things can be depicted without cgi needing to be done masterfully to at least pass closer inspection.

It depends if we’re talking about “drawn” animation, like spongebob or anime, or computer animation, like shrek. Personally, I’d prefer the second option