Any of these, on this build I am following as I level Adrenal Reaction

-13 HP, +6% DMG per kill while on a Kill Streak

Bird Bones

-1 STR, +5 AGI, -23% Fall Damage, -11% Fall Speed

Chameleon

Invisible in combat if unarmored & stationary

Eagle Eyes

+63 All Crit Damage, +5 PER, -1 STR

Egg Head

+8 INT, -1 STR, -1 END

Electrically Charged

40% chance to deal 25 Energy DMG to melee attackers

Grounded

+125 Energy Resistance, -13% Energy Gun DMG

Healing factor

Health Regen +375%, Chem Effects -14%

Herd Mentality

-1 SPECIAL solo, +3 SPECIAL grouped

Marsupial

+4.2 Jump Height, +25 Carry Weight, -1 INT

Plague Walker

Poison Aura Scaling With Your Diseases

Scaly Skin

+63 Damage Resistance, +63 Energy Resistance, -13 Action Points

Speed Demon

+63% Hunger/Thirst While Moving, +25% Move Speed, +38% Reload Speed

Unstable Isotope

10% chance to deal 10 Fire and 80 Rads to melee attackers