Classify the given charaters as heroes, villains, or neither.
Hulk, Thanos
Hulk is generally classified as a hero, while Thanos is classified as a villain.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the given charaters as heroes, villains, or neither.

### Input:
Hulk, Thanos

### Output:
Hulk is generally classified as a hero, while Thanos is classified as a villain.