User blog comment:Hiken No Robin/Kizaru, Pacifista's and Sentoumaru/@comment-1595565-20101022135652

You're reading too far into it. Uncle is simply a term of respect/endearment that people use to refer to elders, often ones the speaker is not related to by blood but with whom s/he is friendly. It's most commonly seen used in Asia. Sorry, I doubt he's a cyborg.