I'm glad this thread exists! I've been curious to know which food combinations affect each character. I'm only on my fourth generation so far (and my toddler just evolved as I was writing this!), but here are my growths and the food I fed at each stage (not including the demo Mametchi):
Futabatchi (mixture, but mostly apples)
-> Hoshitchi (mixture, but mostly apples and broccoli)
-> Nikatchi (mixture, but mostly apples and oranges)
Futabatchi (alternated between chocolate and cookies)
-> Meganetchi (alternated between chocolate and cookies)
-> Mokokotchi (alternated between chocolate and cookies and the occasional hotdog)
Omututchi (exclusively broccoli)
-> Meganetchi (broccoli and some cucumber)
-> Hinatchi (exclusively cucumber)
Omututchi (exclusively lollipops)
-> Meganetchi (exclusively sausages except one steak right before evolution)
-> Soyofuwatchi (will alternate between lollipops and oranges exclusively)
TheYatagarasu, I had the same thoughts as you on Memetchi! I only alternated at the toddler stage to get my missing teen, so will update when it finally evolves.
Eeveelai, did you feed your characters the favourite food of your desired adult to obtain each of them? I'm asking because Kuromametchi seems to be a big outlier for me so far!
As an aside, how long are evolutions taking for you all? My first generation was super regular (30 mins to toddler, 24 hours to teenager and 48 hours to adult) but they've been taking progressively longer with every passing generation (to the point where my most recent Omututchi to Meganetchi took well over four hours, even with regularly looking after it during my flight)...