Official Characters Pack (OCP) for Marvel Ultimate Alliance (MUA) was created to add the DLC content of the Xbox 360 verison to the original PC version ported by Beenox in 2006.
Captain Marvel: IIRC this is from the official HUD head, it matches and fits well with the other HUD head outlines IMO.
Human Torch: Flamed heads usually look weird with a blue outline (IMO). The official MUA HUD heads probably don't have this issue, but others also are also semi-transparent, where an outline looks even worse.
Ghost Rider: Vengeance for the same reason as HT, Western for the same reason as Captain Marvel.
Daredevil: Originally, the HUD heads were HQ with a thinner, slightly different outline (would have to double-check). I like that version of the outline, but change it if you want to (whoever makes this update). I can still keep my own version.
Thor's a similar case as Daredevil, Nick Fury, too.
Cap's WWII HUD head is just a lot more colourful, I think (advanced lighting changes a lot of colours to be less saturated). But brown would look better. I just think it's acceptable the way it is.
Magma's primary HUD head is her only HQ conversation portrait from XML1 and I think it should stay that way for this reason.