Red Dust of Death: Carrion can use Poison. When he does, adjacent opposing characters less than 100 points are dealt 2 damage instead of 1, and adjacent characters of 100 or more points are also given an action token.

Intangible: Carrion can use Toughness and Super Senses. When he uses Super Senses, he evades the attack on a result of 4-6.

Rotting Touch: Carrion can use Exploit Weakness. When he does and hits, until your next turn the hit character can't use defense powers except Super Senses.

In order to give out an action token with Red Dust of Death, does Carrion need to damage the character?
No. Carrion just needs to use Poison. The placement of the action token is not damage dependent.

I notice that the part about giving out action tokens in Red Dust of Death doesn't mention "opposing characters", just "characters". Does this mean I might have to put a token on my friendly characters if they are adjacent to Carrion?
No. In order to place the action tokens, Carrion has to use Poison and the action token placement occurs in addition to Poison's normal effects. Poison only ever effects opposing characters; your friendly characters are safe.