Akari Neo possessed a rare blend of a cute, innocent face contrasted with a voluptuous, "glamour" body. This "gap moe" (the appeal of a gap between contrasting traits) was her selling point, and SSNI-703 was designed specifically to highlight this duality.
Without a clear definition of "ssni703," any analysis remains speculative. However, if we consider the possibility that this refers to a technology product or a similar entity: ssni703 better full