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

Requires no parameters.
Returns nothing.

ZenScript
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ebtLiv.playLivingSound();

Requires no parameters.
Returns nothing.

ZenScript
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ebtLiv.spawnExplosionParticle();

Requires an IEntityEquipmentSlot object and a float.
Returns nothing.

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

Requires no parameters.
Returns nothing.

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