A living Entity is one that has health and that can die.
Unlike IEntityLivingBase however, players aren't IEnitiyLiving objects!

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.entity.IEntityLiving;

IEntityLiving extends IEntityLivingBase. That means all functions available to IEntityLivingBase objects also are available to IEntityLiving objects.

ZenGetter	ZenSetter	Tipo
ZenGetter attackInterval	ZenSetter ​	Tipo int
ZenGetter attackTarget	ZenSetter attackTarget	Tipo IEntityLivingBase
ZenGetter canBeSteered	ZenSetter ​	Tipo bool
ZenGetter canPickUpLoot	ZenSetter canPickUpLoot	Tipo bool
ZenGetter canSpawnHere	ZenSetter ​	Tipo bool
ZenGetter getLeashedToEntity	ZenSetter ​	Tipo IEntity
ZenGetter isAIDisabled	ZenSetter isAIDisabled	Tipo bool
ZenGetter isAIDisabled	ZenSetter isAIDisabled	Tipo bool
ZenGetter isColliding	ZenSetter ​	Tipo bool
ZenGetter isLeashed	ZenSetter ​	Tipo bool
ZenGetter isLeftHanded	ZenSetter isLeftHanded	Tipo bool
ZenGetter isNoDespawnRequired	ZenSetter ​	Tipo bool
ZenGetter maxSpawnedInChunk	ZenSetter ​	Tipo int
ZenGetter ​	ZenSetter moveForward	Tipo float
ZenGetter ​	ZenSetter moveStrafing	Tipo float
ZenGetter ​	ZenSetter moveVertival	Tipo float
ZenGetter renderSizeModifier	ZenSetter ​	Tipo float

Requires no parameters.
Returns nothing.

ZenScript
 Copy
ebtLiv.playLivingSound();

Requires no parameters.
Returns nothing.

ZenScript
 Copy
ebtLiv.spawnExplosionParticle();

Requires an IEntityEquipmentSlot object and a float.
Returns nothing.

ZenScript
 Copy
ebtLiv.setDropChance(IEntityEquipmentSlot slot, float chance);

Requires no parameters.
Returns nothing.

ZenScript
 Copy
ebtLiv.enablePersistence();

First method requires an IEntity object, a boolean and returns nothing. Second method requires two booleans and returns nothing.
Third method requires an IPlayer object and returns a bool.

ZenScript
 Copy
ebtLiv.setLeashedToEntity(IEntity enttiy, boolean sendAttachNotification);
ebtLiv.clearLeashed(boolean sendPacket, boolean dropLead);
ebtLiv.canBeLeashedTo(IPlayer player);