Here is my translation of the Shimbori interview in the article about Tamaki. F is Famitsu, and S is Shimbori:
F: Why did you choose Tamaki out of the XVV characters?
S: At first, I didn't plan for any characters to join from XVV. However, as we had countless requests from both domestic and overseas players, we decided upon it.
When deciding, first of all we narrowed it down based on 'who looks as if they could be a fighter'. Also, as all characters added to 6 so far have had powers beyond the ordinary person, we decided on a different approach this time.
Among those remaining after that, we decided on Tamaki, whose composed adult personality shone among them. All the girls have their charm, and we felt some pressure in deciding amongst them, but seeing the response to Tamaki, we felt relieved that we'd managed to meet their expectations.
By the way, Tamaki called this contest 'the festival of venuses', but she thinks this because because that's what Zack came up with for her invitation. This is a familar method that Zack uses in the Xtreme series in inviting the girls.
F: Why make her fighting style Aidido?
S: As an ex-model and designer she has a beauty in her deportment, and we also considered her nationality and interests such as yoga, and thinking as well of a reasonable mix of power and technique, we decided on Akido: a 'traditional Japanese martial art that relies on beautiful and graceful movements without straining the body'.
The name resembles that of Momiji's style, Hayabusa-style Aikijutsu, but is entirely different. Based on the real Aikido, we've arranged elements such as the throwing forms and strike atemi to match Tamaki.
F: This month DOA6 had a its one year anniversary. What is your message to fans?
S: Thanks to you all, DOA6 has come to its first year since release. While we implemented a number of things, many of them did not work out. We are truly grateful to have come this far, being supported even while causing such troubles for our fans.
Tamaki's costume design and attack design, among other things, I was involved in deeply up to completion. I believe her, as a DOA character to be a complete and well-made character, as a result of our hard devoted effort. I believe her style is enjoyable in a quite different way to other characters. I hope Tamaki fans and others will enjoy her.