Those look fantastic, Fairoaks!
I would run them something like this:
Wrecker
Mystical masher
Archetype: Super (Mastermind+)
Move 6”
Body 6 Psyche 6
Melee Attack: 5D Melee Defense: 5D
Ranged Attack: 5D[2], 15" Ranged Defense: 5D
Psyche Attack: - Psyche Defense: 4D
Major Powers: Enhance (Enchanted Crowbar)
Minor Powers: Power Blasts (Crowbar--Only the turn after someone uses Power Blasts on him!), Resistance, Super-Strength
Backgrounds: Blue Collar, Criminal
Notes: +1D on KO Checks.
Thunderball
Thinking man's brute
Archetype: Wildcard
Move 6”
Body 6 Psyche 7
Melee Attack: 5D Melee Defense: 4D
Ranged Attack: - Ranged Defense: 4D
Psyche Attack: - Psyche Defense: 4D
Major Powers: none
Minor Powers: Clever, Melee Specialist, Resistance, Super-Strength
Backgrounds: Criminal, Science
Notes: 2" Reach on Melee attacks, +1D on KO Checks, +1D or card on Initiative.
Bulldozer
Hard-charging battler
Archetype: Brick
Move 5”
Body 9 Psyche 6
Melee Attack: 6D Melee Defense: 5D[1]
Ranged Attack: 4D, 10" Ranged Defense: 5D
Psyche Attack: - Psyche Defense: 4D
Major Powers: Super-Strength
Minor Powers: Resistance, Tough
Backgrounds: Blue Collar, Criminal
Notes: +1D on KO Checks.
Piledriver
Ham-fisted thug
Archetype: Street-Level
Move 6”
Body 5 Psyche 5
Melee Attack: 5D Melee Defense: 5D
Ranged Attack: - Ranged Defense: 5D
Psyche Attack: - Psyche Defense: 4D
Major Powers: none
Minor Powers: Resistance, Super-Strength
Backgrounds: Blue Collar, Criminal
Notes: +1D on KO Checks.
Feel free to critique and check my math on the above, but I think this makes the quartet interesting and fun to play.
Keep in mind Wrecker's Mastermind abilities reflect his propensity to drive the plot with various schemes (usually related to Asgard and magic), and his mystical crowbar gifted by Loki.