To get LG Avatar items, you have time craft them in the Blacksmith's Station. You also have to find the designs through fighting battles.

I managed to get another Damaged Manikin, which let me craft not only my first LG Avatar item, but a Legendary Recolour Avatar item to.

It's also really creepy, just a warning-

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Mykie: ... What the actual fuck- Why- Why that?? You had another recolour you could of chosen-!!

Because it was creepy- I had to!! I love creepy!!!

Mykie: Oh, so that's why you love Slade-