I've personally always like the Iorwerth, mostly because before the publication of the final quests in the Elven questline the Dark Lord was always thought to be Zamorak RS Gold. I don't know if it is real however I think certain NPCs refer to the Iorwerth in some way as Zamorakians that rebelled against the crystal Goddess-led Elven society. This is why I've always sympathised with Lord Iorwerth's elves.
After the conclusion of the civil war,, the clan is under a new leader and they're trying their best to get as part of the elven world after the trouble they caused, wan't to be seen as valuable and demonstrate their worth. It is impossible to not like them, especially because they're an elven clan that fits me perfectly. The clan's crest is badass.
Clan Cadarn (the second major civil war clan) is one of my favorites. They're also a bellicose clan and are exactly the opposite of Iorwerth. They place more emphasis on magic and stealth than brute force, like the Iorwerth. It is a clan that focuses on my two favorite skills that is always a good thing. However I'm not sure I am a fan of the Crest.
For clan leaders, I'm a big fan of Lady Hefin Lord Amlodd and Lady Meilyr. I love the overall appearance of Lady Meilyr. She looks like some sort of hippy Elf. Her beauty and height are obvious from the moment you meet her Buy OSRS Gold. She is also one the most valuable elf leaders and has all the Herblore (especially the ones which were bought at 10Mish and can't wait to use them), and Dungeoneering stuff.