What do you think of...
Arwen
Spirit Hero
6 Starting Threat
2 Willpower
0 Attack
1 Defense
3 Hitpoints
While Arwen is exhausted, other heroes you control get +1 willpower, +1 defense and +1 attack.
Too strong? Not strong enough? Readying her would be pointless as it would stop her boosting your other heroes.
The stat boost could make other heroes that are usually not so great at questing/attacking/defending more suitable for that role at the cost (in a way) of a hero slot. Low threat could be good for secrecy (so is the stat boost as secrecy decks tend to have weaker lower starting threat heroes) and she could be a decent replacement for Glorfindel in some decks (still providing 2 willpower to his 3 but potentially giving you another point or two if you commit your other two heroes). What do you think?