
Achate is in and of himself fairly harmless; he possesses two physical bodies, one of which is a luxury custom model laced with holographic projection (for those high resolution, real-time expression generator capacities that allow for real-world interaction) and a pair of sweet gliding wings because... well, he's pompous and he likes their look. His second body is a highly illegal but highly efficient biologically human body, with wetware alterations to allow his AI self to settle in with pre-established memory engrams and personality profile, as well as a hook-up to re-upload himself (new memories and experiences included) back to his AI core. Neither body possesses superhuman feats of strength, speed, agility, etc... but regardless of the form he takes, Achate's inclinations run towards scheming machinations.
When I write him into memes I usually consider all participation chronologically mostly-linear, with interactions with other characters affecting his opinion of them later down the line. For a backdrop, I use a 'memecity' generic canon-crossing large urban center. Achate is semi-aware of fourth-walling in that he knows that he's in a city that is not connected to his original timeline and cannon, though he's not aware of other cannons or that characters are controlled by muns, etc.
Achate's big secret evil plot involves a continuation of what he has already done in his home cannon, which is to spread the consumption of nanobiotic drugs that lay an infrastructure in the average human brain to be able to access Nexistence (a pre-established fluid virtual environment) and to repurpose parts of said human's subconscious as a fragment of a server for the use of natural AI environment -- specifically Achate's. If he succeeds, those who have been altered will be able to access Nexistence in a semi-lucid state, but what they're going to be getting is Achate's domain and any digital wildlife that manages to sprout up in the meantime -- by that I mean any subconscious meanderings of connected minds that breaks away from the brains they originated in.
(WIP -- step-by-step of Achate's set-up, permissions, possible requests for CR/storylines, all that fun stuff here!)