I'd like to thank Ripper for his ideas, which have been mashed together with some brainstorming by me and the missus to create:
Creative DMs can probably have a lot of fun with this one describing its random changes in shape from round to round...Doppelganger FreakSometimes a doppelganger just.... fails.Initiative +5 Senses Perception +0Level 1 SkirmisherDoppelganger FreakXP 100Medium natural humanoid (shapechanger)
HP 29; Bloodied 14
AC 15; Fortitude 13, Reflex 15, Will 13
Speed 6mShort Sword (standard; at-will) * Weapon+6 vs. AC; 1d6 + 3 damage.MConfusing Shift (move; at-will)The doppelganger freak shifts 2 squares then makes a melee attack; +4 vs. Will; the doppelganger freak gains combat advantage against the target until the end of the doppelganger’s next turn.CConfusing Shapeshift (minor; recharge 6)Close burst 2; +1 vs. Will; the target is dazed until the end of the doppelganger’s next turn.Combat AdvantageThe doppelganger freak deals an extra 1d6 damage against any target it has combat advantage against.Alignment Unaligned Languages Common
Skills Insight +8
Str 11 (+0) Dex 16 (+3) Wis 11 (+0)
Con 13 (+1) Int 10 (+0) Cha 13 (+1)Doppelganger Freak TacticsA doppelganger freak moves among its enemies, using its confusing shapeshift to daze as many as possible if it gets surrounded.Doppelganger Freak LoreA character knows the following information with a successful Nature check.
DC 17: Occasionally a doppelganger will lose control over its shapeshifting abilities, like a human with a degenerative disease losing motor skills. These doppelganger freaks change shape constantly and randomly.Encounter GroupsDoppelganger freaks are often found aiding lower humanoids like goblins that will hang out with anybody.
Level 1 Encounter (XP 500)
* 1 doppelganger freak (level 1 skirmisher)
* 2 goblin warriors (level 1 skirmisher)
* 1 goblin blackblade (level 1 lurker)
* 4 goblin cutters (level 1 minion)