Okay, so these are the results as I see them based on everyone's comments. If anyone disagrees, just let me know!
1. He has developed a game of strategy played with marbles that he has never lost.
This one is more or less split, an Luna would take it with a caveat, so I would say "no" for now, but maybe something that ties into a story later? Are people alright putting this one on the back burner for the time?
2. He carries what look worryingly like living creatures suspended in jars. The "creatures" are actually frozen in time.
Four to one "no" on this one, it seems.
3. He dislikes sunlight, even more than other dwarves.
Unless I missed someone, this was a unanimous "yes."
4. He has experimented with blood in secret, discovering a few powerful formulas with disgusting side effects.
If we're talking Dwarven Blood, this one seems to edge out in favor of "no." However, expanding it to other types of blood, perhaps Dragon, Hydra, Basilisk and so forth, the opinion seems to be yes. I'm inclined to say "Yes, he probably has, but it's not a major facet of the character." Or something along those lines.
5. He served the required 2 years in the Dwarvenguard, which taught him basic hand to hand fighting, but he spent most of his time guarding a customs office and saw little to no combat.
"Yes" carries the day on this one.
6. He despises boats and most everything associated with sailing.
This one came out as unanimous in favor for those who mentioned it, so "yes."
7. Somewhere, he tricked a dragon with fake precious metals and gems. He still has to return to that plane from time to time.
Everyone who had a yes/no vote voted "yes," so this one is in, too.
Thanks, everyone!
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On a completely separate note, I just want to mention that it's been a very trying and exhausting week. One of my best friends lost his father , a man I've known for over 20 years, and much of my week that hasn't been tied up at work has been spent trying to comfort/distract my friend and to be their for the family.
So I haven't forgotten about this thread, and I think we are nearing completion, but I wanted everyone to know why I haven't been as active trying to move this forward.
If anyone has an idea of where they would like to go next with this build, by all means, say so. If not, I'm sure I'll come up with something in the next few days, time allowing.