significant Trevor

[Bee chase]

No: HPFGUIDX 144623

Luckdragon:
Throughout the HP series I find that Neville's seemingly 
insignificant toad is mentioned an awful lot. Trevor the toad 
desparately seeks freedom from Neville on many occasions, and is 
threatened with poisoning by Snape. We know he is a gift from 
Neville's uncle and that toads are considered one of four acceptable 
pets which can accompany a Hogwarts student. Of course other animals 
are mentioned throughout the series just as often, but all end up 
playing an important role in the magical world. Crookshanks & Mrs. 
Norris are able to detect unsavoury characters/behaviours, Ron's rat 
turns into Peter Pettigrew, Buckbeak helps save Sirius from the 
dementors, the thestrals can only been seen after one has witnessed 
death, and the owls of course are messengers. So why is a simple pet 
toad like Trevor brought to our attention so often and why is he 
always trying to escape from his owner.
Possible theories up for rebuttal:
Trevor is RAB(an animagus in hiding)
Trevor is a horcrux
Trevor is a magically helpful creature we have yet to learn about
Trevor is a spy
What's your take on the toad?