i'd like to bring attention to and discuss the inconsistent categorization of individual tamagotchi characters. as an example of what i mean, mametchi is categorized as a character tag, but chamametchi, who is usually depicted as his younger sister in media, is categorized as a species tag. if you go through the tamagotchi tag as a whole (and ignore all the posts where it's just someone holding a tamagotchi device and there's no tamagotchi character present), you can find many examples of these inconsistencies.
now this is kind of a tricky situation, because they technically classify as both. in terms of the toys themselves, they are considered part of an evolution line, where the quality of treatment from the user determines what the tamagotchi evolves into. in this way, it would make sense to view them as species the same way you would view pokemon. however, in all the adaptations of the franchise (excluding some early japan-only playstation games and various mobile apps that mimic the toys themselves), they're treated as individual characters and, aside from character variations in very early adaptations (which have mostly been phased out of the franchise as a whole), there's never more than one of them. you never see fields of mametchis frolicking, you just have the one singular mametchi.
i'm personally leaning towards that they should be tagged as characters since most of the relevant art is very clearly based off the anime (there's only so much lewding potential from an egg thing that screams at you), but i'm interested to hear your thoughts.