Your limbs can all extend outwards and in odd shapes. 

The range of all your weapons is increased by half your walking speed(rounded down). ex: walking speed of 35ft results in a 15ft melee range.

This also applies out of combat, allowing you to reach things farther away and maneuver them in strange ways.

Your limbs are quite clingy and get wrapped around things easy.

You can use the grapple action on any object, surface, or creature within your range and you use your Dexterity (Acrobatics) to make grapple checks. You can then use your reaction to pull the object or creature within 5ft of you if it is smaller than your size. If the object or creature is equal to or larger than your size you are pulled within 5ft of it.

If you are pulled at least 15ft toward a target and then hit it with a melee weapon attack on the same turn, you can immediately follow that attack with a free action unarmed strike.

Only creatures that can reach your original position can opportunity attack you.

Your body footprint can drastically change.

As an action you can change to be one size larger or smaller for one round. You can hold this size as long as you continually make the action every round.

If enlarged, enemies can move through your space. If they end their turn within your space they are pushed to a space of your choosing within 5ft of your space.