Heimler (ヒムラー Himurā, Himmler in the Japanese version) is an enemy unit in Chapter 12 of Fire Emblem: Ankoku Ryū to Hikari no Tsurugi and Fire Emblem: Shadow Dragon. In the latter, Heimler drops a Master Seal when defeated. He also carries a Door Key, which he will use a few turns into the battle to unlock a door and attack the player units. He has poor HP and defense, but he can easily wipe out any weak unit.
Oddly, despite having a unique name and face among enemy units, Heimler cannot be recruited, does not not have a background story, nor has any spoken lines when he is attacked or defeated.
*Dropped when defeated