I think it's quite ironic that to immortalize your love of Nintendo in a tattoo you have chosen a character created by Rare who no longer is associated with Nintendo.
I do remember seeing official art of Diddy resting on a Nintendo logo but this was way back in 1994 or 95 when the DKC games were current. I believe I have it in an issue of Gamepro but sadly I lack a scanner. It would be perfect if someone could find it.