Sentinel.

Response: After Aragorn commits to a quest, spend 1 resource from his resource pool to ready him.

"I am Aragorn son of Arathorn; and if by life or death I can save you, I will."
–The Fellowship of the Ring

Response: After Théodred commits to a quest, choose a hero committed to that quest. Add 1 resource to that hero's resource pool.

"Not all is dark. Take courage, Lord of the Mark..."
–Gandalf, The Two Towers

Response: After Glóin suffers damage, add 1 resource to his resource pool for each point of damage he just suffered.

His beard, very long and forked, was white, nearly as white as the snow-white cloth of his garments.
–The Fellowship of the Ring

Gimli gets +1 for each damage token on him.

"Men need many words before deeds. My axe is restless in my hands."
–The Two Towers

Ranged.

Response: After Legolas participates in an attack that destroys an enemy, place 2 progress tokens on the current quest.

"I can walk this path, but others have not this skill."
–The Fellowship of the Ring

While Thalin is committed to a quest, deal 1 damage to each enemy as it is revealed by the encounter deck.

There hammer on the anvil smote,
There chisel clove, and graver wrote;
There forged was blade, and bound was hilt;
The delver mined, the mason built.
–The Fellowship of the Ring

Action: Discard 1 card from your hand to give Éowyn +1 until the end of the phase. This effect may be triggered by each player once each round.

Slender and tall she was in her white robe girt with silver; but strong she seemed and stern as steel, a daughter of kings.
–The Two Towers

Response: Exhaust Eleanor to cancel the "when revealed" effects of a treachery card just revealed by the encounter deck. Then, discard that card, and replace it with the next card from the encounter deck.

"Gondor wanes, you say. But Gondor stands, and even the end of its strength is very strong."
–Boromir, The Fellowship of the Ring

Dúnhere can target enemies in the staging area when he attacks alone. When doing so, he gets +1 .

Captains rode to meet him at the ford, bearing messages from Gandalf. Dúnhere, chieftain of the folk of Harrowdale, was at their head.
–The Return of the King

Action: Exhaust Denethor to look at the top card of the encounter deck. You may move that card to the bottom of the deck.

"And the lord Denethor is unlike other men: he sees far."
–Beregond, The Return of the King

Action: Pay 1 resource from Glorfindel's pool to heal 1 damage on any character. (Limit once per round.)

"You saw him for a moment as he is upon the other side: one of the mighty of the firstborn."
–Gandalf, The Fellowship of the Ring

Action: Exhaust Beravor to choose a player. That player draws 2 cards. Limit once per round.

But in the wild lands beyond Bree there were mysterious wanderers. The Bree-folk called them Rangers, and knew nothing of their origin.
–The Fellowship of the Ring