Ninja

User of a trail in darkness, usually a jogger or pedestrian, clad entirely in black or other dark colors with no reflective gear or lights creating a hazard for themselves and cyclists because they cannot be seen until they are about to be hit.

Reference
Derives from the legendary ability of medieval Japanese covert warriors of the same name to become invisible.

Forum Introduction

 * New Crosswalk signs http://bikearlingtonforum.com/showthread.php?p=1166#post1166

Links

 * "Ninja" - Wikipedia https://en.wikipedia.org/wiki/Ninja