Iceman is the strongest character in the game. If you boost him wisely, he can kill most of his opponents with a merely single hit on melee attack. Distribute his Status Points wisely, developing more his Focus and Speed. At his Projectiles
Mutant Powers, concentrate on his Cold Crush, and a little in Freeze Beam and Ice Slide. Do not spend Skills Points in Boost Mutant Powers, as they are useless. Also, if the rest of this is done correctly, Iceman will grow strong enough to easily fight alone. Spend the maximum you can in his Passive Skills, particularly in Ice Combat and Cold Mastery. Get the Danger Room Disk: Challenge - Iceman, and get and equip his Signature Unique Item, Cryogenic Booster. That brings a very good trait, Double Cold Damage. As for other equipment, put some that give bonus to Damage (not Energy Damage, Electric Damage or Radiation Damage). If done correctly, Iceman can hit easily his enemies (because of the high Speed), hit lots of enemies with the Cold Crush Projectile Mutant Power, and, finally, will give lots of damage. For example, you can do 500 and even more damage with melee attack, depending on your level, thanks to the Passive Skills, Ice Combat and Cold Mastery, and the Cryogenic Booster Signature Unique Item.