Render sequence OPen GL, URGENT problem alpha.

The Render is leaving the character in some parts of alpha, I do not know how to solve it . anyone can help me, please?

link of render :

If you’re referring to the black background - be aware that output from
the software is pre-multiplied with black. If you need to edit the image
in another program you just need to let it know this so that it can
properly apply the transparency.

If I have misunderstood your question, please explain further.