It's somehow funny to see such a disagreeable expression on the one face and a more pleasant one on a matching face. That sort of dissonance can only happen with clones or identical twins. Although most of the Misaka sisters are largely expressionless, Accelerator sees such sharp differences in WORST and Last Order sometimes.

Agito's insult holds about as much impact as water on a duck's back; in other words, so little it just rolls right off. Rolling his eyes in response, he then flicks his gaze between the two, listening to Akito's introductions and adjusting his stance as he leans on his cane.

"...Akito and Agito. Heh. I suppose that's better than only serial numbers for the difference." An idle thought enters his mind, only to be quickly quashed. "Let me guess, he's new." The way Akito spoke about his business and how much it took for him to get his own place the last time they spoke gave Accelerator the impression that the kid had had no one else to rely on. He could be wrong, he just has a hunch about this.