I retargetted/made new rig with goals and ik limb. It uses ue5 mannequins animations with a little bit of adjustment. I'm a programmer, so animation wasn't high on the list when I did it. I'm going to eventually add more stuff. I do have multiple static animation poses I did for npc cinematic but cinematic didn't make it in.
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I was wondering why the character was still stuck in the t pose why the character had the t pose when walking .The arms should move and not be stuck in a t pose if you retargted . Have you tried use mixamo auto rigger https://www.mixamo.com Just upload the fbx file there and a rig should be generated then you can use that for retargeting