Small adjustments to the weaker champs that would make a huge difference

HoidCosmere

Pick a champ that is widely considered among the weaker ones in the game and add one small adjustment to the champ that will make a big difference in their usefulness. Have it make sense with the character though.

I'll start it off with Luke Cage:

He begins each fight in indestructible mode for 7 seconds, but then never again in the fight. Make him like Unst. Colossus, activate indestructible every time he triggers a special attack. This would be helpful on attack because you can spam special one and keep him from taking any damage for 7 seconds at a time. In war defense, put him on special one bias. Without a good power control champ, he will time out a lot of players. He still wouldn't hit very hard, but his damage reduction compensates that and its an ability he already has, just enhanced a bit.

K1lltastic

Spider-Gwen:

Change her sp1 to instead cause some form of mild damage, and apply a power drain or armour break. She became even more useless once they 'fixed' her, and she gained the ability to change stances while dashing back and holding block for 2 seconds, while still using up her sp1 to change stances. It's a complete waste of a special, and of a dash back ability. One of those two things needs to change.