Malcolm, James, and/or the Pottle boy
From The Heretic Knowledge Vault
Members of the Random Bully's gang in Saus, where they mug the unsuspecting Chris. They then make the mistake of inviting Meji Hinadori to the mugging, whereupon they discover, in a terminally messy fashion, that Meji is a lot more of a badass than any of them are.
We don't know who is who in this bunch; it's unclear whether "the Pottle boy" is one of Malcolm/James or someone else, and the Random Bully himself may be one of these three (two?). We likewise aren't sure they're really living-impaired, but getting launched into the air and/or having a two-ton rock materialize and fall on you does tend to ruin your day. (RB himself definitely did escape, to be tracked down by Sarine Elle.)