Who to onetrick/main?

Pyke support sounds up your alley

Pyke, Fiora, Riven, Jayce, Kaisa, Vayne, Lucian, Leblanc, Ekko, Thresh, Evelynn, Nocturne.

All of those can be aggressive hard carries, some for each different role, (though thresh doesnt do damage by himself generally). All can be mechanically skillful, and most of them are not hard ban/pick so you can play them fairly easily.

EDIT: gave a list for you to try out to see who you like best

Tbh your keywords seem to describe Gragas perfectly

come over to the dark side

joking aside though pyke is pretty good, or maybe leesin

Sion... always Sion...

I would say all these champs are mechanically Difficult, Aggressive play makers that are capable of "wow'ing" the crowd.

Edit : i think the style of champ you're looking for are feats most commonly found in Current Meta Junglers.

I won't list already called ones one of the most mechanically intensive champion in game at all. I wouldn't say she has many tricks though, but if you play her very well it can already be playmaking (or more correct to say outplaying) playmaking given your tank understands how to use your ult hard mechanics is about how fast you press buttons and hit skillshots. Playmaking ult.

Mechanical playmaking champions? LeBlanc is probably the best solo mechanically intensive champion who can solo carry.

FOUR SCOOPS OF ORA CMOOONNNNNNN