Stoned (Pre-Sgrub): Uses normal grammar, end punctuation, and AlTeRnAtInG lEtTeRs. Uses 'motherfuck' and variations of it a lot.
Stoned (During and Post-Sgrub): Stops using end punctuation. Alternating caps pick up a new pattern. Punctuation and spaces are now counted as "letters", so iT'S GoInG To lOoK A LiTtLe sOmEtHiNg lIkE ThIs.
Sober: Changes from all caps. TO NO MOTHERFUCKING CAPS BETWEEN LINES. Swears more than usual while on his uppercase lines. He kept this style after having the rage papped out of him, but is calmer overall.
Sober (Meteor): Alternating caps retain same pattern. Adds spaces in compound words at random, such as mother fucking.
Mind Control (Aranea): Aranea forbade Gamzee from speaking every again while mind-controlling him; after this, he communicates solely with a :o) emoticon and his signature honks.
Released from mind control: Briefly reverts to pre-Sgrub quirk. Unknown if this will stick given the massive HONK that followed, however.