The funny thing is that despite the many surface-level similarities between Mettaton Undertale and Tenna Deltarune; both being rectangular, charismatic TV Hosts who subject the Player Characters to many TV-Themed Minigames and a ‘score’ based Sparing Mechanic
And they even have a very similar taste is suits!
On a deeper character/thematic level, they’re actually total opposites.
Mettaton is the Underground’s only celebrity and main source of entertainment, he’s highly watched and highly popular (Well, within the standards of the Underground, it's implied they are just not that many Monsters around). Meanwhile Tenna’s whole thing is that he’s been abandoned and ignored by the whole Dreemurr family. Outcompeted and overshadowed by the many other sources of entertainment in the modern Light World.
And while Tenna is motivated by an obsessive desire to not be abandoned ever again, to keep Toriel and the Fun Gang on his shows forever… One of Mettaton’s biggest flaws is his tendency to abandon those he’s close to. He pretty much cut ties with Shyren and Napstablook when he became a star.
And he’s been growing distant from Alphys as well.
And, actually his whole darn motivation is to abandon the Underground in search of even greater fame on the surface.
His Pacifist Ending is all about him confronting that flaw in himself, understanding how important he is to the Monsters of the Underground and deciding that he should stay so he can keep bringing his brand of entertainment, joy and glamour to the people who needs it.
While Tenna’s Happy Ending is about helping him to get over his obsessive neediness to entertain specifically the Dreemurr family, and realizing he can move on to someone else, to someplace else, who will actually watch him.
On a deeper thematic level... I think you can also talk about how Mettaton is driven by his Dreams, while Tenna seeks Hope.
And also, I always saw Mettaton as representing modernity for the Underground.
Due to his human-fanboyism and fascination with the Surface, Mettaton has ended up creating and/or promoting a lot of aspects of modern human culture in the Underground. Mass media entertainment, merchandise, trademarks, fast-food, minimum-wage retail jobs, unions…
All of these things seem to exist in the Underground primarily or entirely due to Mettaton’s influence.
Every other Boss/Main Character has some kind of ‘official position’ in the Kingdom's traditional power-structure; Sentry, Royal Guard Captain, Royal Scientist, King, Queen, Prince… Mettaton is a creation of the Royal Scientist, but on his own he’s just a rich and famous celebrity. That's kind of a modern concept in it and of itself, since it kinda requires the existence of a mass media culture....
Or hell, just the fact that he’s the one Monster in the game who seems to have no real respect/loyalty for the Monarchy, and is actually working against him…
Both out of his individual sense of morality (he cares for the Humans) but also for the sake of the very modern goal of mass fame.
And of course on the most obvious level he’s a technologically-advanced robot whose ‘zone’ is the most tech-themed part in the game. (Zones? if you wanna count Hotland and the CORE as separate areas. Either way it's true of both when compared to the rest of the Underground.)
And Tenna is obviously the exact opposite of this. He and his Dark World are still kinda tech-themed in the sense that he is a Darkner based on a household electronic device, but he’s still clearly supposed to stand as a vast contrast to the much-more advanced techy-themed Darkners of Cyber City. He’s specifically meant to be themed after outdated and old-fashioned technology
And the concept of Nostalgia.
… In a way, despite Undertale being a very 2010’s game and despite the Underground being established to have 2010's technology such as Social Media… Mettaton's being primarily a TV Star with TV Show theming in most of his encounters is a very 20th century sort of concept. To use the Television as a shorthand for the concept of modernity.
Obviously that works within Undertale because that is a very familiar cultural shorthand and also it does make sense within the Very Particular Technological and Cultural Framework of the Underground… But with Deltarune being both a much newer game and taking place in a world much closer to our own, I guess it makes sense to instead use the TV to symbolize the past, outdated technology and nostalgic yearning.
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