Delwyn, from Ultima V: Lazarus
Delwyn is a beggar in Minoc who is smarter than he lets on.
When meeting him in Ultima V, the Avatar showed him kindness and gave a donation, thus showing true Compassion and Sacrifice. When returning later, Delwyn offered the Avatar a secret for another donation: the shop owner Shenstone always acts suspicious at noon and it should prove worthwhile to shadow him.
The hint was good, since Shenstone was hiding skull keys.