Andalites -
2 monsterous humanoid HD
Str +2 Con +2 Int +4 Cha -2
size: medium
space/reach: 5ft/5ft
base speed 60 ft
tail blade 1d8
Ex: Tail Flurry: They may make two tail attacks at highest Bab, but each attack that turn takes a -2 penalty.
Ex: Telepathy: Andalites lack mouths, and communicate mind-to-mind. They may project speech in to 1 or more creature's minds to a range of 100 ft, regardless of language (though the intelligence of the creature limits their ability to process it). Alternatively, the andalite may "shout" their telepathy, increasing the range to 200 ft, but every creature in range "hears" it.

Yeerks -
1 aberration HD
Str -10 Dex -8 Int+2 Cha+2
size: fine
base speed: 5 ft
Ex: Mind Control: A yeerk may enter a humanoid or monsterous humanoid's head and attach itself to the brain. While attached, the creature is dominated, as the spell. No save is allowed, even if the yeerk forces the creature to do something extremely contrary to its nature.
Ex: Kandrona Reliance: Every three days, a yeerk must be directly exposed to kandrona rays or it dies.

Taxxons -
3 aberration HD
Con +2 Wis -4 Cha-4
size: large
space/reach: 10 ft/5 ft
base speed: 40 ft, swim 40 ft
bite 1d6.
Ex: Terrible Bite: Because a taxxon's bite is exceptionally painful, anyone who is successfully hit by the bite attack must make a DC 13 fort save or be sicked from the pain for 1 round. The DC is con-based and includes a racial modifier.
Ex: Scent
Ex: Hunger: A taxxon is ravenously hungry at all times. If they smell blood, broken flesh, carrion, etc., they must make a DC 15 will save or seek out and eat it, regardless of what else may be going on around them. If the source is still alive, they attack and then eat. They will even eat themselves, if injured. They may make a new save at the beginning of each turn to regain control of themselves.

Gedds -
1 humanoid HD
Dex -2 Int-2 Wis-2 Cha -2
size: medium
space/reach: 5 ft/5 ft
speed 20 ft

....yeah Gedds really are that lame

Leeran
2 aberration HD
Int +2 Wis +2
size: medium
space/reach: 5 ft/5 ft
speed: 20 ft, swim 30 ft
Ex: Amphibious: a leeran can breath in water or air freely
Su: Read Mind: a leeran may cast detect thoughts, as the spell, at-will, though the range is changed to a 20 ft radius around them. Additionally, the leeran gains all information from the spell on the first round (presence of minds, intelligence scores, surface thoughts). The save DC is wis-based.
Su: leerans are psionic, giving them 2 power points. Note that they have nothing to spend their points on without taking class levels.

Howlers
4 monsterous humanoid HD
Str +2 Dex +2 Con+4 Wis -2
size: medium
space/reach: 5 ft/ 5 ft
speed: 30 ft
2 claw attacks 1d6
natural armor +2
Ex: Superior Fast Healing 5: unlike normal fast healing, this ability allows the howler to regrow lost limbs and body parts. The severed limb returns once the howler has healed damage equal to the damage taken from the attack that severed the limb.
Ex: Spot Weakness: a howler's vision is penetrative, allowing them to see vital organs and weak spots through a creature's skin. Double the critical threat range of any weapon they wield.
Ex: Howl: as their name implies, howlers have a sonic-scream attack. The howl affects all non-howlers in a 30 ft radius. Each creature must make a DC 15 will save or be stunned for 1 round. Because the howl is particularly devastating to intelligent creatures, each affected creature takes a penalty on the save equal to their intelligence modifier. This ability takes a move action to use, and the howler must wait 1d4 rounds before using it again. The DC is con-based and includes a +3 racial bonus.

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I'm pretty happy with those stats. I don't feel that there's enough info on the Skirt-Na to make stats for them, so I left 'em out.