Proto is Section 9's only (prototype) bioroid member and was also the Tachikoma's maintenance technician (before becoming one of the new recruits). During the Dejima crisis Proto played a key role in helping Aramaki rescue the Prime Minister Yoko Kayabuki, who had been relieved of her duty and arrested under charges of treason.  Proto managed to gain access to the net, where he communicated with Section 9's Tachikoma units. Through them Proto was able to gain building blueprints and up-to-date information on Section 9's Dejima operation, as well as the location of the Prime Minister, before an attack barrier disabled him. Proto appears again in the Ghost in the Shell: S.A.C. Solid State Society movie, wearing the black uniform of Section 9 along with a sidearm, which suggests that he is now a field officer.  (wikipedia)

Compilation movie of the "Individual Eleven" story from Ghost in the Shell: SAC 2nd Gig series. 
(Source: AniDB)

Andrew Toth is a voice actor based in Vancouver, Canada.

A.D. 2034. It has been two years since Motoko Kusanagi left Section 9. Togusa is now the new leader of the team, that has considerably increased its appointed personnel. The expanded new Section 9 confronts a rash of complicated incidents, and investigations reveal that an ultra-wizard hacker named the Puppeteer is behind the entire series of events. 
In the midst of all, Batou, who was stalking the case on a separate track, encounters Motoko. She goes away after saying, "Stay away from the Solid State Society." Batou is left with a doubt in his mind. Could Motoko be the the Puppeteer? 
The series of intriguing incidents that Section 9 faces gradually link together almost artistically. Who is the Puppeteer? What will happen to Batou's relationship with Motoko? What is the full truth behind this carefully planned perfect crime? And what will the outcome be? Mysteries surround the Solid State Society... 
(Source: Production I.G.)

In a futuristic world where the internet and cybernetics has blurred the borders between societies; the members of Public Security Section 9 are reinstated to assist in solving numerous cases of cyber crime. 
A spate of similar crimes committed by separate suicidal groups known as "The Individual Eleven" becomes the core focus for Section 9 as war approaches in the form of refugees flooding into the country.
 
(Source: Anime News Network)