No. Arwen is not a playable character in The Lord of the Rings: Conquest on any platform.
| Faction | Characters |
|---|---|
| Good (Gondor/Rohan/Elves) | Aragorn, Faramir, Legolas, Boromir, Gandalf, Éowyn, Haldir, generic heroes (Captain, Archer, Scout, Mage) |
| Evil (Mordor/Isengard) | Sauron, Witch-king, Lurtz, Gothmog, Gríma, generic heroes (Orc Captain, Uruk Archer, Troll, Warg Rider) |
Arwen appears in cutscenes/lore but has no gameplay kit. Mods on PC might add her, but not on Xbox 360.