First, found another one I forgot about:
R-AA 'Setsuna's Fault -AW' by Multiple - [Status=Not Complete] - [Last Dld=05/13/2008]
As for the ones with others as androids... well...
Ranma is not an android, but everyone else on board is, and he is now in charge of them, while dealing with cancer.
R-AA 'Ark' by Multiple - [Status=Not Complete] - [Last Dld=03/02/2006]
He has to deal with Ifurita, and a Nabiki., Kodachi, and Akane who are androids of sorts.
R-AA 'Ifurita 1-2' by Multiple - [Status=Not Complete] - [Last Dld=04/28/2008]
Raised by them in:
R-AA 'Machines of Loving Grace' by Kwakerjak - [Status=Not Complete] - [Last Dld=01/31/2007]
Deals with everyone turning into one in:
R-AA 'Ranma's Robogirls' by Multiple - [Status=Not Complete] - [Last Dld=04/25/2006]
Deals with Sailor scouts converted to Robots in:
R-AA 'Setsuna's New Life-SA' by Multiple - [Status=Not Complete] - [Last Dld=04/07/2008]
And done even better in:
R-AA 'Tabula Rasa' by Multiple - [Status=Not Complete] - [Last Dld=11/25/2007]
The Tendos are converted inadvertantly by Happosai in:
R-AA 'Toy Tendo's' by Multiple - [Status=Not Complete] - [Last Dld=05/01/2008]
In the following, Brianna turns a love struck Peebo into a robotic assistant for Ranma
R-GD 'The Black Paw' by Ice-Tea-1983 - [Status=Complete] - [Last Dld=01/24/2008]
Following has Kasumi as always having been an android. I really wish he would write the second chapter.
RANMA 'Not a Clue' by Ozzallos-TeflonBooger - [Status=Single File] - [Last Dld=09/19/2005]
While not centered on it, I consider this a runner up, as his interactions and fights with Kos Mos are interesting:
R-AA 'No Tendo' by Multiple - [Status=Not Complete] - [Last Dld=05/04/2008]
A couple runner ups, both for others and for Ranma:
Ranma is downloaded into a computer system, and learned to live with the change.
R-SM 'Not Like You' by Lord CBoD - [Status=Not Complete] - [Last Dld=09/08/2007]
A ship born AI he deals with and calls Akane. It was to be a few chapters, but only ever saw one here on Fukufics.
R-MULTI 'Absolute Power Leads to' by deathgeonous - [Status=Single File] - [Last Dld=04/16/2007]
Sort of like the above, but Nabiki is the AI:
R-SM 'The Immortals Series' by NighthawkTM-Cute Neko Kaydee - [Status=Not Complete] - [Last Dld=07/14/2002]
EDIT: Forgot one
R-AA 'ID4' by Multiple - [Status=Not Complete]