I'm thinking of things like the PC with the mysterious mentor; with the relatives/love interest/etc back home in the village; who escaped from slavery (or whose family have been sold into slavery); the hunter/tracker/ranger (often an elf or half-elf); the stalwart dwarf and/or paladin and/or cleric; etc. In 4e we could add the mysterious PC with a pace (an invoker, a tiefling, a warlock, perhaps a tiefling warlock-invoker!).What are the "pretty standard tropes"
In my experience, though, on its own this tends to produce shallow NPCs with little investment on the part of the players.Whereas, a good party is pretty easy to prepare some hooks for in comparison. all you need is a damsel in distress, and the Dudley Dorights show up. I'm exagerating, but the concept tends to pan out.
I think I might have been a bit harsh in this thread.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.