I don't personally find Trickster interesting as a class other than as a meme, but I'm not bothered by it's existence and the experimentation of it.
What I think the class needed to open it up to a wider audience was to be able to summon enemy creatures. This could have been the maister skill to stop Warfarer's for being too strong yet again and I would implement it like this;
Part 1 of the skill is capturing the essence of the enemy. Part 2 is releasing the essence as a summon. Rince and repeat.
The bigger enemies like cyclops and dragons could be captured but wouldn't last as long due to need more essence to sustain.
This would buff up Trickster nicely, allows them to buff the summon along with pawns, allow them to do grounded and boss level content.
If you don't agree, how do you think Trickster should have worked?
You can lean into the smoke and mirrors for more effects without having summons and stuff for direct damage. Trickster would have been great for unique debilitations - why they didn’t get the blinding smoke cloud is pretty baffling when thief already gets stealth mode. Maybe something to make monsters cough and choke, acting like a mini stagger / out of stamina effect. Something to make enemies think your ghost is attacking to trick them into a defensive stance. Effects that trigger when your ghost is defeated similar to stout undead or oil slimes when hit with fire. Make your pawns think the enemy has you in their grip so they focus on the one target.
They had a lot of room to add in more mechanics but they stopped really short, I feel.