Background
Motivation
Although his designation is listed at 5th of a series, SEN has not discovered any other droids like him. He wishes to find out what happened to his predecessors, or at least locate their appendages' knowledge.
Obligations
SEN has shown a remarkable generosity to other droids, mechanics that fix them and engineers that create them. This does not extend to most "squishy" lifeforms he encounters - usually they are obstacles to his objective or
His approach to older biological beings is more reserved - "why terminate processes so near completion if they have not inconvenienced thus far?". SEN considers this gerontophillia not a preference, but part of his core programming. He is proud to study all things ancient, and considers this "useful" knowledge worthy of sharing with others.
Description
Removable head that holds the secondary processing unit for astronomical observations and long term storage memory. Having a veery similar build to a B2 super battle droid (except for the head). The detachable "appendage" as SEN likes to call it may at first seem indispensable but is often left behind onboard for safekeeping or to design new infinite-precision-arithmetic behavioural-error checks. SEN seems predisposed to allow these processes to continue whenever a powerful enough computer system is available. He struggles to explain why any of it is important, but In fact, it may be the only "soft spot" on such a well-armoured robot.
This droid was created with a purpose, and was deliberately placed in a shell that can protect its contents from various environments. It is self-aware but lacks the empathetic qualities of many protocol droids (as well as their tact).
Its use of outdated languages and poorly timed jokes hints at a much older year of construction...but the outward materials are new.
Although SEN shies away from "crude" weapons like blasters and other imprecise area of effect objects. However, SEN has a knack for unconventional weapons - often redirecting his opponents offensive powers against themselves. If possible, SEN removes himself from danger with a jetpack or seeks to negotiate a way of retreat without conflict.