+3 INT +1 WIS

They're smarter than their slime brethren after all

Immunity to slash damage reduce damage dealt by Bludgeon and pierce by 2

Constitution +3

Able to climb up walls with ease and able to squeeze through the tiniest of holes but items unable to fit through will be left behind

A slime body has its use and that's being hard to get and hard to hit 

Able to copy any creature it has eaten,bonded with or given it's permission. copies their feats stats abilities everything.

To copy or not to copy is up to this little fella

Grants ally resistance to diseases poisons and status effects that the slime has already analyze before for 5 hours. 
Also washes ally and heals minor wounds

 A good bath before the battle bonds them together 

+5 AGI and Dex in/on water rain or water related areas like swamps and Marshlands 

But -3 Con and STR in hot climates like deserts 

Can produce clean water as long as it regains more water from lakes or rain later it should be fine.

Rain and Rain dont go away 

+2 CON +1 AGI

+2 Charisma

You wouldn't get charmed by this thing would you?