Ryoichi Tanizaki

Origin: Doctor Who
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Species: Human
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Occupation: Doctor (specialising in cybernetics)
Residence: Bardilac Street 10 (7-119)
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Languages: Japanese
Import Date: Year 6 (+).

Dr Ryoichi Tanizaki (PROSE: The Torchwood Archives) was a Japanese doctor studying cybernetics. Ianto Jones hired him to help reverse Ianto's girlfriend Lisa Hallett from her conversion into a Cyberman. He had shown a keen interest in the Cybermen ever since the Battle of Canary Wharf.
He died when Lisa tried to "thank" him by removing his human weaknesses by converting him into a Cyberman, which was horribly botched. (TV: Cyberwoman)

Torchwood website
The series 1 version of the Torchwood website included a profile on Tanizaki compiled by Ianto Jones. The profile stated that Dr Tanizaki was head of the Cybertechnology Institute of Osaka; the CiO was founded in 2007, following the Cyberman invasion, to monitor and learn from the Cybermen and their debris.
After early experiments proved unsuccessful, Tanizaki commented during an interview: " I wish I understood them. It's like hoping to find God on the autopsy table - all you're staring at is a set of parts. In some ways, horrible as this is to say, I wish I'd become one of these creatures. Just to know how it all happened. What if felt like - even though, of course, we know that these poor creatures felt nothing at all".
Ianto noted that Tanizaki was incredibly fussy about travel and hotels; first class and five star. He was very keen to know what kind of treadmill was in the hotel gym, due to a recurrent knee injury.[1]