Corrupted Steven

• Steven universe future
• ep.19 i am my monster
  
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• Corrupted Steven
  
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• Superhuman Strength: He was able to destroy several parts of the Crystal Temple and unfused Alexandrite with one hit. Even though he was restrained by Lapis and then the Cluster he released himself almost effortlessly.
• Superhuman Durability: One of his horns could withstand blows from Bismuth's enhanced shapeshifting.
• Shapeshifting: Since Steven turned into a monster due to his thoughts of being one it was clear he kept this ability. It appeared that as time passed Monster Steven decreased in size; this could be seen that after appearing as tall as the Crystal Temple he later looked only a few meters taller than his fellow Diamonds.
• Willpower: Steven was able to power through and tank almost everything thrown at him due to the will he inherited from his mother and his own humanity.
  • Magic Immunity: Due to his raw emotions and hybrid status Steven could partially resist even the abilities of the other Diamonds, being relatively unfazed by Yellow Diamond's light destabilization and Blue Diamond's pathokinesis, additionally overwhelming White Diamond's mind control.
• Water-Walking: He was capable of moving and standing on liquid surfaces as seen when charging against his friends and family; this is an ability shared with Lion and other Gems.
• Gem Half/Pink State: Since Steven transformed while in the state of his Gem half it is possible he kept the abilities while this form was active and could be the reason Steven gained the power to truly challenge the other Diamonds and turn into a monster in the first place.
  • Sonokinesis: After charging up which resulted in his spikes and eyes glowing pink Steven could let loose a roar that managed to send everyone within range flying to the point Garnet unfused into Ruby and Sapphire. The attack also created a shockwave that pushed away the ocean and cracked the ground surrounding him, even knocking over the incomplete Diamond Mech and awakening the Cluster. This could be a stronger version of Steven's scream when tapping into his mother's original powers.
• Healing: After being embraced by his family and friends Monster Steven began crying causing the water around him to turn pink which could be attributed to Steven's ability to heal or resurrect Gems and other living beings.

Weaknesses

• Intelligence: After becoming a monster Steven seemed to be reduced to a mindless creature that attacks and destroys everything that moves or stands in his way. This was shown when he fought recklessly instead of formulating a plan, only made animalistic sounds and didn't use his original or more complex abilities.
• Emotional Manipulation: Since his transformation is the result of Steven's negative emotions it is clear that more positive emotions can work against him. This was used to make him understand that since he was there for everyone he cared about they loved him unconditionally and would return the favor, which resulted in Steven remembering everything and turning back to normal.