Most unique/fun to play champion?

Unique? In my opinion,

Most fun? Depends. It is incredibly funny to land a 2k crit with or

The one that i think is most exciting is , because you can just spam taunts and is great at pushing, and can be really punishing for a bad engage.

Hard time responding here, since fun is such a subjective term. Do you find it fun to mess around with Bard's goofy kit, or landing those ridiculous full-build Draven crits? But if were to go with the unique champ route, I might just recommend Ekko, Bard and Gnar. I think you'll find something other champs can't offer you from them.

Full damage support. No wards. Just blow up everyone that shows up in your lane. He's fun, and his abilities are fairly unique.

Singed is probably legitimately just the most fun for me to play. None of this proxy shit, either--it has its fans and merits, but it's not for me.

All man-mode, high health and defense, solid damage, Liandry's for burn over time, and you just fucking survive. Just crush into the enemies, bait the chases, peel everyone and everything, and glue your enemies to the floor in a fog of poison so thick they'll need wards to see their way out.

Worst case scenario they ignore you and you get to pop your ult and run into the enemy backline, and play fetch with your Warwick using an enemy Vayne as the stick. Best case scenario you piss them all off and get Jarvan ulted 1v5 in the river before throwing him out of his own crater, juking Ahri's charm, and running away for eighteen minutes at 100 health, getting a triple kill and two supports in an ace spamming your laugh the entire time.

The Donger is the most fun champ to play. Sitting in lane and watching your lane opponent struggle is while you play minesweeper is fucking hilarious.

Ekko is a good pick. Fun to play, very versatile. Can top mid and jungle. Good damage, pretty mobile, lots of tools at his disposal.

Has a very fun to play kit.

No one comes close to being as fun and unique.