Jisho

You can do whatever you want to do, if you really want to do something. You could choose any kanji that exist and tell people it's pronounced はいせ. But you'd have to be prepared for the weird reactions you'd get.

What is the reason why you want to use kanji?

I really like the symbolics behind kanji ,and majority of my influences and inspirations are from Japan and so id like my pseudonym to represent that

I switched accounts because i couldnt get the confirmation email

Can anybody answer me please?

Nobody will tell you that a bad idea is a good idea just because you want it to be one. It's easy: Are you a Japanese citizen and do you have a name written usually in Japanese kanji? Then sign your work with that. In any other case: Don't. (Exceptions only for some rare edge cases like sumo champions, but not for me or you.) Or do whatever you please to do, there's no law against it. It's just that you can't expect people to share your views. What would you think about Japanese person that starts to adopt a Western name and if asked why they did so started to talk about being influenced by cowboys, burger and fries, and American culture?

I would think that he is lit.Isnt it cool to mix influences and have uniqueness instad of zoning ourselves from the beautiful world on the other side of the plant!!!

Just to be clear... you don't live in Japan, or want to use a kanji name as your legal name or anything like that... you just want call yourself Haise, and you want our permission to do so?

No I want the right kanji to write it down since it will be pseudonym and i asked for the help to write it

I'm not a japanese citizen

Is there not a way for Haise to be able to be made as a name and that to be legal or not?

Yes, you can. Many people use pseudonyms for their art or other works, there's absolutely no legal barrier regarding that. However, no matter how much you want surname to be a name, because there are no precedents of it being a name, people will assume it's a surname. Also, I tried to find people called Haise and I could only find Fred Haise (who isn't even Japanese) and Sasaki Haise, yes, the character from tokyo ghoul you certainly got this name from and it seems like the author of this manga just made it up to be honest, so it's going to be quite obvious. It's not advisable to go with names you find in manga and anime because they are either very rare names, over the top badass names or names that don't even exist.

You could write it like this: 排泄

Guys, I really cannot keep silent. I'm surprised a person who clearly said he wants kanji for a pseudonim gets so much negative response. Not for signing a document. Not a persmission. Right?
As for the question, it is hard to guess what the author prefers, so I'd go with a general advice - you could split 'haise' into 'hai' and 'se', or 'ha', 'i' and 'se', or 'ha' and 'ise', and search for kanji wich such readings. It will take time but will let you choose what you want. To make it look like a real name, you could check existing names in Japanese ending in 'se' (like Nanase etc.) and take one of the most common kanji for your 'se'.

@Eine, not sure what you mean by "so much negative response."

It wasn't really clear what they wanted. If it's just a pseudonym, then why ask for a "proper" way to write it?

Maybe you interpreted my flippant response as negative, but it's just... if it's not for any legal purpose then what does it matter, he can do whatever he wants and doesn't need any input from us.

@Leebo
By 'negative response' I mean calling it a 'bad idea' and saying 'you can do whatever you want' and speaking about 'permission' and pointing out several times that the topic starter is not a Japanese instead of trying to help =)
Not just your answer, I mean this topic in general. I don't want to be rude myself, but I wouldn't call it flippancy, rather it sounds like a jeer.
As for 'doesn't need any input from us' - now this is really strange that you must think so, because the question is really so simple. It's true that we cannot guess what kanji would please the author, but it's absolutely obvious that they want a kanji combination that would make it look and sound like a real name, not a random word. This is what they meant by 'proper' and 'legal', I daresay. And this is the input they want.

First names in Japanese are somewhat famous for being quite creatively constructed by parents, such that natives aren't able to guess what the reading of the chosen kanji might be. When you consider beyond that that this isn't meant as a first name, but just as a pen name, the bounds of names become even looser. That's what I meant by our input not being necessary.

If you look at the pen names of Japanese artists and mangaka, often they are not "real names" but just what look like Internet handles.

If a Japanese person was asking if they could use, well, just about anything as their pen name in English, I don't really see how the answer would be something other than "sure, whatever floats your boat, it's your name".

Can anybody help me about picking kanji thats read "hai""se" or "ha""i""se"?
Leebo i really apreciate your effort but i felt really offended by you calling it a bad idea when in reality its just a creative idea for me wanting to have a usable legal in japan first name and it being a creative pen names even if it means being unique its why i asked here in the beginning i wanted to make a name but im very confused of which kanji to use?Any help please

There's no difference between "hai""se" and "ha""i""se", both are はいせ.
There are hundreds of kanji combinations that would be more or less fitting. Like dunno, 羽射世 or something. It's not a normal name that any Japanese person has, though, so it's not possible to choose something conventional, because the name itself isn't.
And dude, your expectations still seem to be warped imho. Imagine a Japanese coming to the forums of the Oxford Dictionary on the internet and posting "Can Schlurpquickle be used as a name?". There'd really not be a lot to say except that there's no precedent of Schlurpquickle being used in the English language as a name, but whatever floats your boat. It's definitely not a name you should try to use for yourself at your next job interview, but it makes a fine online handle. As in all of your ramblings in this thread you never actually explained anything about the context you want the name to be used for, it's really just guessing on our side and erring on the side of caution.

Ha: http://jisho.org/search/%22%E3%81%AF%22%20%23kanji
I: http://jisho.org/search/%22%E3%81%84%22%20%23kanji
Se: http://jisho.org/search/%22%E3%81%9B%22%20%23kanji
Hai: http://jisho.org/search/%22%E3%81%AF%E3%81%84%22%20%23kanji
Ise: http://jisho.org/search/%22%E3%81%84%E3%81%9B%22%20%23kanji

Take your pick.

Thank you so much this is what i've been looking for!!!