Some thoughts:
- Always remember Glorantha is a setting and Heroquest is a game
that uses that setting. Go with what your Heroquest game requires,
even if it is not published Glorantha.
- Oddball characters: There is a real danger they can steal the
limelight fromother characters, or be difficult to narrate within a
group framework.
- Hero Bands: After reading MOLAD I realize quite how much Hero
Bands are your friends here. The problem is that while we know that
as the Hero Wars approach many new, or old but forbidden, ways of
thinking will come to the fore again in a struggle of competing
ideologies, Heroquest works best in communities. It is a perfect
setting justification for your own ideas and themes, but (once
again) Heroquest works best in communities where relationships are
important.
So create your own Hero Band. A Hero Band gives you the ability to
define that 'local' belief, custom, or behaviour within the context
of a community. The guardian lets you give adherents special magic
(add a small religious cult if you need to) to further their cause.
The community gives the player relationships. (And if the players
want to explore an idea or ideology they can create their own
vehicle for it).
So in your case a hero band let's call em for argument the 'The
Lost Dragon Souls' could be a collection of individuals - dragonewt
souls - disrupted from their usual progression, but seeking to
continue on their path to dragonhood (there is a dragon power hero
band in MOLAD that will help). Glorantha also considers some
dinosaurs to be dragonewts who were interrupted on thier
progression. So the band might be a led by a hadrosaur etc. The idea
is to work with the player to create a society that shares his
goals. It also gives him a part of Glorantha to put some 'crunchy
detail into' his band.
Anway I am sure you can come up with something even cooler.
But generally I say, get MOLAD, and see how you fit all those cool
ideas for behaviour/magic/ideologies into your game without having
to create a new culture or people, yet still keep the community
aspect of the game.