Oliver may be a ghost but he's not lost his sense of humour. His death may have been tragic but he decided that as most of his life was so fun he wanted to stick around with his friends a bit longer. About the only things he can't make a joke about are poachers - they make him mad and if he sees any in his ghostly state they’d better watch out.
In Oliver's opinion, life (or the afterlife) isn't worth living unless you make time to enjoy it. Oliver is happy to quietly hang around his guardian's neck for a while if they are busy working, but his guardian should understand that being busy all the time isn't good for you. If the guardian can't remember that, then Oliver will be there to help them take their healthy dose of rest and fun.
|Left - Loveable Oliver thinks pulling faces is funny. Right - He finds it hard to stay still at times!|