So about the questing, since that looks to be what this thread is about. I would say Iksar have the MOST race specific quests for Shadow Knights. However, a lot of random quests that don't look to be race specific. Hope this helps ya out.
Here are some quests that I can think of.
https://wiki.project1999.com/Ridossan%27s_Spirit
https://wiki.project1999.com/Darkforge_Armor_Quests
Erudite:
https://wiki.project1999.com/Experienced_Courier
Dark Elf:
https://wiki.project1999.com/Thex_Mallet_Quest
Iksar:
https://wiki.project1999.com/Dreadscale_Armor
https://wiki.project1999.com/Crusader%27s_Tests