thing i think about a lot is tenna being positive about things people either dislike about thhemselves or have been ostracized for. the implication that spamton doesnt like his nose (“my days of being a long-nosed doll are over”) while tenna literally took the nose himself to look similar to spamton, and also with the spamcannon having a shorter nose and tenna calling the short nose disgusting, meaning he finds spamton actively more attractive with the long nose.
or even more prominantly with susie, basing an entire game around her enjoyment of smashing things and letting her go to town on the drumset without scolding her or talking down to her. jokingly playing off her putting a swear as her name instead of getting mad. making susie hurling fireballs down the lane into part of the cooking minigame. overall accomodating susies crass sense of humor and tendency to break things.
Yeah, Susie is even directly rude to him, and he doesn't get upset in the slightest and even plays along, like when she says "Where's the "shut up" button?" and he replies "Sorry, kid, that's premium!", or when she asks "How do I kill this guy?" about Tenna's in-game insert and he replies "Get in line, kid!". He's probably one of the only adults she has met who doesn't police her language and doesn't try to get her to be all "proper" and just lets her express herself and joke around; he doesn't take it personally and understands that she's just a kid being a little rude and this isn't something she needs to be punished for. (Toriel is kind to Susie, but Susie knows that adults don't approve of her usual behavior, so she self-censors around Toriel to make sure Toriel likes her.)
There's also, like you mentioned, Tenna letting Susie hit and break things. Instead of trying to get her to Not Do That, he gives her a healthy outlet for it, like giving her the drums and letting her have fun and play however she likes by making her performance not affect the party's score, or having breakable things in The Legend of Tenna, or having her fight people in the Monster Movie game - with her costume probably softening her blows, meaning she gets to punch/kick while not doing much damage/causing much pain.
(And yet, there are people who claim that he couldn't be a good parental figure.)
All of the people Tenna has bonded with have been some sort of outcasts. Spamton, Mike (seemingly a willing recluse, but still isolated in some way), Susie, and also Kris, whose imagination had a big influence on him, and Kris is the only human in a town of monsters, adopted by a family of monsters. Tenna really connects with people who struggle to fit in/feel like they don't belong, and like you said, he's also shown to accept or even like the specific traits that cause them to get ostracized and/or that they themselves dislike. I'm sure him being autistic and queer and probably unusually big even in-universe has nothing to do with this. (Jk, it definitely does.)
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