This thing looks like a slender hairless monkey with a pair of big black eyes.
CR 1; XP 400
N Tiny Monstrous Humanoid (shapechanger)
Init +2; Senses darkvision 60 ft.; Perception +1
AC 14, touch 14, flat-footed 12 (+2 Dex, +2 size)
hp 13 (2d10+2)
Fort +1, Ref +5, Will +4
Speed 30 ft., climb 15 ft.
Melee 2 claws +6 (1d4)
Space 2-1/2 ft.; Reach 0 ft.
Str 10, Dex 14, Con 12, Int 9, Wis 13, Cha 13
Base Atk +2; CMB +2; CMD 12
Feats Weapon Finesse
Skills Bluff +7, Climb +8, Intimidate +7, Sense Motive +7, Stealth +10
Language understands Common
SQ mocking visage, read emotions, voice mimicry
Environment any urban
Organization solitary, pair
Mocking Visage (Su) A doppelmocker can change its appearance as a swift action to appear as distorted miniature of any humanoid, monstrous humanoid, or otherwise anthropomorphic creature it can see or it has seen since its last sleep. This cosmetic effect resemble disguise self but is a physical change that is not subject to disbelief. When a doppelmocker uses this ability it can make a Bluff or Intimidate check as a free action, against a single creature within 30 feet that can see it, to demoralize, fool, feint, threaten, distract, or taunt. It can also make a Bluff check as a part of its movement to avoid attacks of opportunity.
Read Emotions (Ex) A doppelmocker can read emotions of other easily. It treats Bluff and Sense Motive as its class skills, and it can perfectly tailor threats to a creature, ignoring size-difference penalty to Intimidate checks. It also gains racial bonus to Bluff, Intimidate, and Sense Motive checks equal to half its HD (or half its master's character level), and a +10 racial bonus to sense enchantment effects with Sense Motive skill.
Voice Mimicry (Ex) A doppelmocker can perfectly mimic voices heard since the last sleep. While doppelmockers can't really form their own words and sentences, they are capable of responding meaningfully to communication by quoting recently heard sentences or pieces of sentences (they seem unable to rearrange order of words, but they can cut the sentences where it fits them).
Doppelmockers seem to be related to doppelgangers in a way that monkeys are related to mundane humanoids, distant, but undeniable kin. They are much smarter than monkeys, being close in their intellectual capabilities to an average humanoid and capable of understanding speech, though they lack the ability to speak and form sentences. Instead, they use their excellent voice mimicking ability to quote recently heard words and whole sentences. They can also change their appearance to match recently seen humanoids, but as they retain their Tiny size while transformed, rather than pretending to be mimicked individuals they use their shapechanging ability to distract, entertain, fool, or terrify.
Doppelmockers are surprisingly strong for their tiny size, and quite cheeky in their behavior, often bordering insolence.
A spellcaster with Improved Familiar and 5 or more caster levels can select doppelmocker as a familiar, though patience is required to deal with the creature's impertinence as it tends to mock its master often.