The Lenny Conundrum Wizard runs the puzzling riddle game Lenny Conundrum. It's he who comes up with the majority of the questions.
He also had a guest appearance in the Altador mini-plot, wishing to surprise his uncle Finneus by restoring his favorite Meepit plushie to good-as-new condition for his birthday. In the end, he accidently tore off the plushie's head but by doing so revealed a plot clue. Finneus forgave him, fortunately, and appreciated the birthday effort.
It is unknown how Finneus can only be his uncle, given that Finneus was frozen in time for a thousand years and the wizard presumably was not.