I recently challenged myself to carry only one pen - and I managed to get it down to two: two Daily Carries, both Nakayas, a kuro tamenuri Long Piccolo and a matte black Piccolo (and I can't believe that the unpolished shu is uninked! It feels weird!).
I'm mainly using the Long Piccolo (clipless), and I think it qualifies as a serious pen. Even a Serious pen.
But I don't think anyone notices my pen(s) or attributes any degree of serious I might exude to my pen. Admittedly, I seldom find myself in situations these days when I have to project Serious. If I do, though, I will probably have the Long Piccolo in hand.