Alter Ego: Red Hulk: Give General Thunderbolt Ross a power action that deals no pushing damage and replace this character with IH #028 Red Hulk on its orange starting line. Existing actions tokens on this character and action tokens for this action are applied to the replacement. This power can't be countered.

The Hulkbuster: Friendly adjacent characters of 75 points or less modify their attack values by +1 when attacking a character that can use Super Strength. If any friendly character attacks a character named Hulk, that friendly character modifies its damage value by +1.

See Alter Ego powers for common questions.

With The Hulkbuster special power, does a character need to meet the requirements of the first modifier to use the second? Would only friendly adjacent characters that are 75 points or less modify their damage values against Hulk?
The Hulkbuster does two completely unrelated things. Each modifier is checked and determined separately. Now, there very well could be times when a character meets the criteria for both modifiers (and will modify both attack and damage values by +1), but neither modifier is contingent upon the other modifier being used.