I think the "unprofesional" argument doesn't really hold much weight personally; it just sounds like something an office worker would say. It's conservative, conventional and boring. My view is that "Kiki" is a separate entity: it's the persona you use for your writing. I think it would only ruin the hard work you've put in so far if you started doing some of your work using your real name and some of your work as Kiki; people would think they were two separate people. I'm not really one to submit to the conventional though, and I think if you used your real name you'd be doing just that. My opinion is that you should do all your writing work under the same name, and that Kiki is fine. There will always be people who have an unfavourable opinion of you: if there aren't you're doing it wrong. You need to let your work do the talking, not your name.
