So my DM is big on an old PC of mine - an Elven Ranger/Sorcerer/Eldritch Knight, who ended the game with a Silver Dragon wife. He planned to revive his clan with her, and "reinvigorate" the sorcerous blood for future generations. Now, his kids would be half-dragon elves, which is obvious. Some would want to be Rangers, some Sorcerers, some a mix of stuff.
The Half Dragon Sorcerers would have the Shadow bloodline, simply because the campaign involved alot of stuff which could easily taint both parents. So if you're asking the question of what bloodline for half-dragons, yet aren't redundant, there you go.
Anyhow, in picking out what the grandkids, great grandkids and so on would be like, I figured that the draconic blood could manifest in those who were Rangers, too. I looked at the Shapechanger archetype, which has a dragon form, and thought it was a good fit, until I saw that the class also had to pick other forms, too. That's a bit off-putting. Then, removing the other forms (and giving 3 favored terrains starting at level 8) became a nerf... also not cool. So here's what I did.
The Dragonform Archetype is a descendant from the union with a dragon, 2 or more generations back. The ranger, in communing with nature, also discovers the ability to turn inward, and bring out the old, draconic heritage.
Dragonform (Su): At 4th level, the dragonshaper can take on the aspects of a dragon once per day as a swift action. He can remain in this form for a number of rounds equal to his ranger level + his Wisdom modifier. The ranger's skin becomes rough and scaly. While in this form, the ranger gains a +2 natural armor bonus to AC, energy resistance 10 (determined by the dragon ancestor), and gains the shapeshifter subtype.
At 9th level and again every five levels thereafter, the ranger may use this ability one additional time per day. This is not a polymorph ability; the ranger can be affected by a polymorph ability and retain his bonus and traits gained by the class feature. This replaces Hunter's Bond class feature.
Master Dragonform (Su): The ranger's dragonform becomes more potent. While using dragonform, the ranger gains a +4 natural armor bonus to AC, energy resistance increases to 20, and gains a fly speed of 40 feet with average maneuverability. Alternately, the ranger can polymorph into the form of a dragon as if casting Form Of The Dragon I (ancestral dragon type only). This replaces the Master Hunter class feature.
1st <--> 1st favored enemy, track, wild empathy
2nd <--> Combat style feat
3rd <--> Endurance, 1st Favored Terrain
4th <--> Dragonform
5th <--> 2nd favored enemy
6th <--> Combat style feat
7th <--> Woodland stride
8th <--> Swift tracker, 2nd favored terrain
9th <--> Evasion
10th <--> 3rd favored enemy, combat style feat
11th <--> Quarry
12th <--> Camouflage
13th <--> 3rd favored terrain
14th <--> Combat style feat
15th <--> 4th favored enemy
16th <--> Improved evasion
17th <--> Hide in plain sight
18th <--> 4th favored terrain, combat style feat
19th <--> Improved quarry
20th <--> 5th favored enemy, master dragonform
How would measure this to the base ranger, or to other archetypes?