Arlo is a merchant that can be found in Oxford Circus Station. He sells low level weapons, armor and other items.
Arlo and his brothers, Spud and Nemo, have carved a modest life out of London's fall despite being profane beyond all reason.
Psych Mon. still uses the brothers as crude initiation studies for would-be Monitors. Hapless recruits exposed to the collective force of Arlo, Spud, and Nemo have been known to walk aimlessly for weeks, relating their newly-expanded vocabularies to anyone who'll listen.