Does Near want to use the death note for himself?
There's nothing that I have read or watched in DN that indicates to me that Near is interested in using the power of the book for himself; he is interested in capturing a mass-murderer!

Oba-sensei was discussing the character's childish nature, but being cheeky, ill-mannered, underhanded and generally pugnacious does not mean that he wants to kill people using supernatural agencies!