Vixen vs Morlun

Yea, but Morlun can choose to absorb energy or not.

Spiderman was forcefully making him absorb it by punching him.

ok so Morlun was interested in Spidey because he represented one of the Totems he needed in order to live. I wonder if Vixen would represent more than one totem...

Her totem/innate abilties are in direct contact with the Red, so she might be a one-stop meal.

If he can absorb that much energy at one time

ok well it seems we don't have enough info to know who would win this fight.