My favourite character is definitely mametchi hahaha.. Personally not a fan of kuchipatchi cause I always thought he looks like a green platypus (no offence to those who likes him)..
I kinda like Kiraritchi, Harptchi, Karakutchi, and Righttchi. I wish they have Yukinotchi too in it. She's actually my top favorite female Dream Town character.
I've never been that big of a fan of Kuchipatchi, but this just made me like him more than I used to!
Mametchi will always be my favorite, because that's the first Tama evolution I ever got, back on the original release.
Also, I've never seen the anime, so I'm purely basing my opinion off of the sprites in game and art I've seen, but I find Spacytchi and Hoshigirltchi adorable, even though they're "poor care" characters.
Out of the new characters on the Tamagotchi Friends, I'd say Knightchi and Pianitchi would probably be my favorite boy and girl respectively. I'll give quick explanations why.
Knightchi being revealed as one of the new characters for the P's when it was initially announced was a "holy cow, did Bandai Japan just read my mind?" type of deal as I was hoping for a knight based Tamagotchi to at least show up, especially considering there are so many knight based Digimon (Including the Royal Knights who are directly based on the Knights of the Round Table). Giving him an alter ego based on another franchise I'm a huge fan of (KnightGingatchi, who is based on the Ultraman franchise) just made the whole thing that much more epic for me.
As for Pianitchi, my reason for being a fan of hers definitely stems from me also being a huge fan of Melodytchi. I played a lot of piano growing up (Even though admittedly I wasn't ever good at it) so that also plays a major factor. It's similar to why I'm a fan of Melodytchi in a way, as my niece plays the violin regularly and was actually just starting to do so when she was introduced.
I really like Knighttchi too, he's my favourite Tamagotchi character by far. I'm obsessed with all things Medieval, so a knight character was a welcome addition! I'm also fond of Wagassiertchi. I like anything even vaguely plant-themed, so the fact that he has Leaf Hair is cool.
I'm also a big fan of Kiraritchi because of her active and upbeat personality in the anime, and her ridiculous hat.
I don't particularly like Yumemitchi. I just find her.....a bit boring, I guess. I also dislike Himespetchi. Everyone else really likes her it seems, but I find her irritating and odd-looking XD