ANYWAYS more informative wise, I thought it was probably unhealthy but lol i did it anyway. And I can say with some certainty that no, it's not unhealthy, unless you make it unhealthy. Do you want to only ever speak to an imaginary friend, saying "fuck the rest of the world" and become an isolated hermit babbling to yourself? Yeah, that's no good. Creating tulpas isn't "serious business" to the extreme, but you've got to put thought and effort and realization into it. It's not something you should want to do over a weekend and then drop, basically.
Logically, tulpas don't exist in the real world. I'll be frank, they're most likely whatever your brain assumes to be going off of the personality that you give them. They're not real people, but... the trick to tulpaforcing is assuming from the very start that you're talking to another person. And you'll feel like an idiot. I did! But it's really rewarding to eventually sense some sort of response. You can't see it or hear it (usually) but it's a nice feeling to finally get feedback. Tulpas are almost never violent, but mine has encouraged me to smoke because she likes the taste of hand rolled cigarettes (and I don't blame her, they're amazing). For the most part they offer "advice" (which may or may not be helpful), critiques, and suggestions. It's like racking your mind for an idea but instead it's like a brain secretary giving them to you.
how many writes have done this? and it is sad how reality works. maybe it is good. the idea of power, to make something from nothing, to viably exist for you and others (I read some story about a roleplayer and their "character" that wound up popping up in the mind spaces of the friends their creator had made, after the creator/owner's death. not sure if that was a soulbond, tulpa or something else)
but then I could see someone be upset of the idea of you "playing god", and not so much "mommy/daddy" I guess it's how you treat them.
I have a personal character that could be "good idea" to tulpaize. but then maybe not. plus then I'd assume writing about him as a fantasy character would be easier. "hey this is you, write you." or assume i should consult him about it. "ah hey, I want your character version of you to like coffee, do you like coffee? how about a wife? is it ok if you are a manwhore? what is with that look you are giving me!!!! ok, so you don't want to be a womanizer and you think it is deplorable."
fun. but i think it would make my head burn. there is alredy enough back seat chattering that is not easy to connect with as it is.
and it's going to not make me able to be ok with being alone. even if they are fragments of me. I'd want constant companionship even more.
and then more 'real'. without then going in an existential frenzy over the notion of real and existing. quantum philosophy or something.
Tl;dr: if you're interested it's worth a try, just don't do it because you want to humor the idea or have an imaginary sex toy. -gags- it is all in your head and you will feel like an idiot. Don't go too far and don't neglect the real world. Everyone should have an individual level of when it's getting to weird. That's where you stop. The idea itself is weird as is.
personal character Donovan would really flip a shit over someone wanting him to be an imaginary sex toy.
and some back seat chattering of mine gets sad if i call them imaginary. "that hurts you know".