Delete background, change color of video
You can also use DaVinci Resolve.

First node: You can use a qualifier to get the basic outline of Dr. Manhattan (not the glow around him, but the darker blue parts).

Second node: You can feed one output from that first node through hue vs. hue to convert blue to yellow.

Third node: You can feed another output from the first node to a mask.

Fourth node: You can then then blur the mask (outside only, not inside and outside) and tint it to make your yellow glow.

Fifth node: you can use the mask of the 3rd node to select the output of the second node and composite that with the output of the fourth node to get a yellow body with a yellow glow, and no background.