Oh, like the TamaWalkie and Arukotch versions. Pedometer pets are really fun, TamaWalkie travels across North America based on your steps, trying to find pieces of their ufo that shattered into a zillion pieces (they've got imagination). It would be great to have a TamaWalkie with color pixels.
Not sure if its already included but I'd like a pedometer to be included into the tamagotchi, and with it you'd unlock milestones and prizes for your tamagotchi. Milestones would be like '1000 steps taken, tama gets sporty outfit' or '3000 steps taken super special hidden game unlocked'. Then once all the milestones are unlocked steps could just reward you with mystery bags that have a chance of anything from treats, money, or a random stat boost token.
It would be fun to have something on the tama that would require you to be active with it.
I don't have an Arukotch, but on this one, a girl Tamagotchi walks around looking for boys and treats, a bit shallow, but probably fun, imo.
That would be fun to incorporate into the ideal Tamagotchi.