So, the Echo Knight just came out in Explorer's Guide to Wildemount, and it seems pretty cool. There are a few ways that the mechanics can be twisted, or "taken advantage of" that come about in strange ways. One of these ways is if you summon an Echo Warrior, and then wild shape or polymorph into another animal (assume brown bear). Would the Echo Warrior also change into a brown bear, or remain in the same form as you were in when you summoned it?

The strange thing about this is that when you take the Attack Action, you can have your attacks originate from the Echo Warrior's space instead of yours. So, if your Echo stays in the same form, it can make bite and claw attacks, while still in a, say a human, form. Or, if you turn into a Giant Eagle, and make talon attacks, but from your Echo's space, how does that even work?

I would say the echo changes too. It is an image of you after all.

Notably, a Brown bear's multiattack is not an attack action, so you would need extra attack to make multiple attacks with the echo.

Quote from DxJxC >>

I would say the echo changes too. It is an image of you after all.

Notably, a Brown bear's multiattack is not an attack action, so you would need extra attack to make multiple attacks with the echo.

 Yes, thanks for the correction. 

The only reason I would have the Echo change would be to explain the different attack options.

Plus its AC, HP, movement, saves, etc are not determined by its form.