Soul companion

You and your companion are seemingly of one soul possibly split into two forms or maybe a bond so tight that you your souls connect. You can share your physical forms among each other, be it a little to give you more speed or a all to change into your souls version of your companion. Your companion can share your ability scores or you may roll specific ones for it. 

Soul shift

At 3rd level, you you and share your physical form with your companion and any percent you flow into your companion flows into you. 50% shift you would be equal half  humanoid half your companion and the same for them. If you transfer all your essence your companion becomes a humanoid version of itself and you become a beast of the same type as your companion. 

100% shift

In this for you use your companions stat block but keep your wisdom. 

25% shift

You share a quarter of yourself with your companion and feel your body increase in strength, wis, dex, or charisma depending on your companion. And ur companion increases its intelligence and can speak. 

50% shift

When half shifted you gain all natural attacks from your creature and it’s movement speed. You also get the higher of whom Evers physical ability scores but share your intelligence. You may not cast spells beyond 25% shifted.

Faster shift

At 7th level, you gain one of the following features 

Flight or fight

Flight let’s you double your movement speed. 
fight let’s you use the barbarians rage feature. 

Shared experiences

At 11th level, you gain one of the following features of your choice.

Shifting master

At 15th level, you are in total command of your shifts and you and your companions mind are almost one in the same. 

Instant shift

You can shift instantly