They are astro and protocol droids and they are not programed for combat, even though R2 can shock, spray oil then burn the enemy, and many other tactics but they just aren't programed for combat as I have already said.
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C3po
It's a rectangular shape.
C3PO During the escape from Hoth, Han Solo referred to C3PO as the professor.
Anakin Skywalker
yes the gayest! C3PO declared his love for R2-D2 in Episode 2. He then proceeded with his love and later on married R2-D2 in the ficitional episode 7.