Actually a neologism, a neologist is one to creates neologisms. Technically, since the term 'neologist' is a 'neologism' it self-perpetuates simply by existing- or not, technically.
A neologist is one who makes up words
Neologist: "Then I told him to go worbunk himself, else I'd go get my argon beam and suptifly 30 hyrdrolargs of kensiom on his ass"
An individual inclined to making up new words. Based on the noun Neoligism: The introduction or use of new words or new senses of existing words.
John being a neologist had a habit of making up new words that strangely enough while newly formed appeared to make sense.
John is neologistic in nature.