Goanna chose the warlock job because he's always enjoyed being a bit unsettling, but in that gets-under-your-skin way of someone who is exceedingly charismatic. The constitution bonus that comes from being a big lizard also helps.
Recently rewatched an old childhood favorite of mine “The Rescuers Down Under”. Wanted to redraw my favorite character as a Salazzle. Worked out much better than I thought.