Well, just before I answer, welcome to Tamatalk! Before making a post, make sure you read the PINNED Topics at the top of the page. I hope you enjoy the site as much as I do!
Anyways, the answer. Tamas can evolve into any kind of character, and there isn't really a line between good and bad characetrs due to level of care. Don't get hung up on what you get, just enjoy playing with and enjoying your tama!
There's no good or bad characters, its the way you care for your tamagotchi. Each new generation, try and care for the tamagotchi different to how you did before.(e.g only feed your tama apples and Sushi)
Okay, if you want to get in that type of question, Hanatchi is bad care. Are you talking about Hanatchi? (the blue slug/snail) Don't worry all types of tamagotchi's are cool. ^_^
Well, to my knowledge Hatenatchi is the baby character of Hatenazoku. Therefore, Hatenatchi is not good, it's not bad, it's not even normal. It's all three!