As a Tahm Kench main, I've gone very deep into his lore and quite frankly, I've become bored with it. I was just curious as to whether my fellow LoL peers might have any small interesting facts, pieces of art, or songs about Tahm that might fulfill my hunger for his lore. And by all means, if you have something cool other than a fact, piece of artwork, or song, then please still share it. I'm already excitedly anticipating your responses!
I am also a Tahm Kench main! But his full lore isn't out yet. But what I can tell you is, If you listen to his VO, you can learn some things about him personally like when he's talking to amumu "Friendship is barely an appetite, but one I do sympathize with" And them go back to his video when he says "They never got a seat for me! So I need men like yourself...to let me in" Apparently Tahm is aware that he is lonely and do think about companionship some times
I'm not sure if it counts towards the "small interesting facts" you're after, but Sarah Fortune has a vested faith in the River King. In Shadows and Fortune, she's depicted as kissing a relief carving of his wicked grin as she's fending off the dark host of the Shadow Isles.
Tahm Kench has the lore and personality of four regular league champs, so I'm not quite sure what you're expecting here.
I didn't even realize his full lore wasn't out. I look forward to it too if they do plan on adding more! I'm sure there are plenty of tales to be told about Tahm and his... deals.
A very interesting tidbit about Tahm is that we don't know his true name - in the beginning of his reveal, there is a gambler whose name was Tahm Kench. The gambler's name has thus been associated to be the demon's name ever since, presumably because the gambler may have been from Bilgewater.
This is also why Tahm (the demon) is represented as he is now - a catfish-like creature with a suit - because the locale suits his tastes.
