Shapechanger Bloodline

Sorcerers of the Shapechanger Bloodline are usually connected to a powerful entity with the capability of adapting and changing their form. This more powerful entity could be member of the metallic dragons, of shapechanging fiends or even the natural shapechangers like doppelgangers, which have been empowered with some sort of magical event. Eitherway, their distinct ability to change shapes and their adaptability merged together with you and your magic inside you, allowing you to modify your body and your magic. You could also be the product of a mad wizard, either being created him/her or enhanced by him/her, granting you the ability to adapt to most situation. Either way, your sorcerous power allows to evolve your body beyond the mundane understanding and being a master of adaptation in almost all situations.

Arcane Adaptation

Starting at 1st level, you learn additional spells that allow you adapt to most situations. You gain extra spells at 1st level (disguise self), 3rd level (enhance ability), 5th level (fly), 7th level (polymorph) and 9th level (telekinesis), which all count as sorcerer spells for you but they don't count against the total number of your spells known.

When you reach 3rd level, you also learn the alter self spell, which counts as a sorcerer spell for you but doesn’t count against your number of sorcerer spells known. In addition, you can cast it by spending 2 sorcery points or by expending a spell slot. If you cast it with sorcery points, the spell doesn't require concentration and the spell duration lasts for a number of hours equal to 3 + your Charisma modifier (minimum of 4 hours). You can end it early using your action.

Expert Infiltrator

Starting at 1st level, you become more adapt at using your words to influence others. You become proficient in the Charisma (Deception) and Charisma (Persuasion) skills and you double your proficiency bonus for any check you make using either skill. You also learn two languages of your choice in order to infiltrate other races. 

Additionally, you can unerringly mimic the speech of another person or the sounds made by other creatures. You must have heard the person speaking, or heard the creature make the sound, for at least 1 minute. A successful Wisdom (Insight) check contested by your Charisma (Deception) check allows a listener to determine if the effect is fake. 

Advanced Adaptation

At 6th level, you can expand 2 sorcery point when you cast one of your Arcane Adaptation spells. If you do so, you can cast the spell as a bonus action and increase the spell duration by one step. This means a spell duration of 10 minute becomes 1 hour (for the fly and telekinesis spells), a duration of 1 hour or longer becomes 8 hours (for the disguise self, alter self, enhance ability and polymorph spells) and lastely a duration of 8 hours or longer becomes 24 hours.

In addition, when you first gain this ability you gain one of the following traits, which becomes a permanent trait to you:

• You gain darkvision out of a range of 60 ft. If you already have darkvision, increase its range by 60 ft. 
• You can breath air and water and gain a swimming speed equal to your current walking speed. 
• You gain a climbing speed equal to your current walking speed. This ability allows you to move up, down, and across vertical surfaces and upside down along ceilings, while leaving your hands free. Extremely slippery surfaces can still impede this.

When you spend at least 1 sorcery point, you can change your current trait of this abilities to another of your choice.

Wings of Evolution

At 14th level, you gain the ability to sprout a set of wings from your back, gaining a flying speed equal to your current speed. You can create these wings as a bonus action on your turn, which last until you dismiss them as a bonus action on your turn. The wings take on any appearing of your choice, usually blending in with your current form.

Mastery of Adaptation

Starting at 18th level, you learn either the shapechange or true polymorph (your choice), which counts as a sorcerer spell for you but doesn't count against the total number of your spells known. Your chosen spell doesn't require verbal, somantic and material components for you. In addition, you can use this ability to cast the chosen spell once without expanding a spell slot. Once you cast the spell using this ability, you can't do so again until you finish a long rest.

When you cast the spell on yourself (using this ability or with a spell slot) you can spend 6 sorcery points to no longer needing to concentrate on the spell and if you target more creatures than yourself, you don't have to concentrate on the spell for yourself but you must still concentrate on the spell for the other creature(s). You can still end it early at any time, requiring no action. The spell also counts as an Arcane Adaptation spell, for the purpose of your other Shapechanger Bloodline abilities.