Smurfling - Small Sized, Blue Coloured Fey

I wanted to create something like these for my fae themed game a while ago, but didn't come up with a good way to run them. Inspired by the tv cartoon that I used to watch in my youth.

Smurfling

Tiny Sized Fey                                   CR 1

AC 16 (+2 Dex, +2 Natural, Size +6), Touch 13, Flat 13

HD 1D6+1 (4 hp)

Saves Fort +1 Ref +4 Will +2

Init +2

Speed 10

Str 5 Con 12 Dex 15. Int 10. Wis 11. Cha 13

Base Atk +3      CMB -4      CMD 8

Melee +3 weapon (Hammer or Slingshot 1d3)

Special Attacks Joined Attack

Special Defenses. Reduce Injury 3 / -, Playful Demeanor

Skills Craft (Any One)+ 3, Climb or Swim +4, Perception +3; Perform (Dance) +10*, Stealth +6

Feats Weapon Finesse or Skill Focus (Any Craft)

Environment Garden or Candyland

Organization Gathering (50-400)

Treasure Half (gems, coins or potions)
Alignment  Any Good ("Bad" Smurflings are Neutral aligned)

Advancement By class (Expert, Rogue, Druid or Ranger most common)

For every additional HD achieved: +2 in Reduce Injury and +1/+1 in ability score adjustments. They also increase +1 in natural AC for every 2 HD gained.

Reduce Injury: Similar to Damage Reduction except it minimizes only after basic injury is inflicted, reducing damage on a one-to-one basis until its limit. For example a 1 HD Smurf would be affected: 
One damage Inflicted = One HP Dmg Taken
Two damage Inflicted = One HP Dmg Taken
Three damage Inflicted = Two HP Dmg Taken

Joined Attack: The few times Smurflings cannot use their charm or escape an encounter through wit, they are able to attack en masse. For every four that attack the same foe, increase both the base calculation and damage dice. (1d3 -- 1d4 -- 1d6 -- 1d8 - 1d10). 

Playful Demeanour Smurflings gain +8 on social skills due to their playfulness. Fey and good aligned outsiders would never consider hurting a Smurfling.

Smurflings are one and a half foot tall fey that have blue skin. They reside in mushroom homes within their forest villages, living in balance with the environment around them. Friendly and helpful, they are keen on making new allies but prefer to avoid strangers as they have been hurt in the past. 

These magical creatures are at one with the animals, plants and fey beings around them. Most of their allies believe they arise spontaneously during blue moon months, a new Smurfling is born inside a blossoming flower. Smurflings are a male species, while there are crazy rumours of females being hatched, this has never been proven. 

Most of their kind focuses on one type of craft to specialize in, not for profit but for the benefits it brings to their village. Smurflings sometimes gain Rogue or Ranger classes to defend their kin and friends from the dangers of the forest. Druid is the most common spell-caster, though Bards just as respected. 

As a magically enriched fey race, Smurflings are living spell components, they do not need components for spells of less than 5th level. In addition, they can create spells that typically fit into another casters area of specialty, but the Smurfling casters can still cast. If working in conjunction with others, they can enhance spells or reduce saving throws beyond comprehension by dance or musical accompaniment. For this reason many evil spell casters seek them out, waiting to use them to buff their castings. While their allies are always concerned, these fey always finds a way to overcome threats.

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I am leaning towards using  Reduce Injury to replace simple Damage reduction.