We know how Clover feels about the Main Monsters... but how do the Main Monsters feel about Clover?... Both before + after the Pacifist Ending? :)
(The main characters: Asgore, Toriel, Papyrus, Sans, Undyne, Alphys and Mettaton!)
That is a really good question. I'm suprised I hadn't done anything with the subject yet. Since you aksed, I'll give the before and after of the Pacifist Route.
Before
Toriel: To her, Clover is the child she failed before she even learned his name. She doesn't know much about what is going on outside of the Ruins besides what she heard from Sans and what information came through from Napstablook and the Spiders. She is happy that Clover is alive
Papyrus: He doesn't have anything against Clover. Sure, it's his job to take him down and his following, but that isn't personal. Paprus doesn't know much about him, but he's sure that Clover has good intentions, even if he doesn't quite understand them.
Undyne: She hates him. She hates Clover with her entire being. She views Clover as a brat trying to destroy everything that Monsterkind has worked for. An infection which turns Monsters against. She wants to personally deliver his Soul to the King. However, deep in her soul, a small part of her is scared. The way Clover carries himself, the way he speaks, and the way his eyes seem to glow when he is angry all paint a picture of someone you don't mess with. Someone who has crossed certain lines before and can cross them again
Alphys: She's scared of Clover. She doesn't believe that he will hurt her physically, but that is the impression that the cold look in his eyes leaves you with. The blackmail, knowing that he can discover and expose her darkest secrets if she doesn't comply, doesn't help.
Mettaton: He finds Clover boring and doesn't believe he is tapping into his full potential. He's glad that the cowboy is working so hard to protect humanity, but he doesn't need to be so dull about it. The boy was born for the cameras, and yet he refuses to tap into his full potential. Also, he totally isn't salty about Clover refusing to be interviewed. This has nothing to do with that.
Sans: Seems cool. Didn't tip him for his Hot Cat, though.
Asgore: Asgore is one of the few characters who sees Clover as a child. A child who grew up too quickly, but a child nonetheless. It is why he allowed Clover to see the human souls. He doesn't want to fight Clover, not just because of what it would mean for his people, but also what it would do to the young boy with kindness as great as his anger.
After
Toriel: Toriel was surprised by Clover's attitude when she met him. Him being cool with Agore almost caused her brain to crash. Clover isn't what Toriel had expected, but she still cares for him. She just isn't used to humans that act so... grown up.
Papyrus: Imagine his surprise when he learnt that his friend Martlet his friends with their enemy, Clover. Jokes aside, Papyrus concluded that Clover is a pretty cool dude after getting to know him, even if he is a bit too cynical for his tastes.
Undyne: Her hatred for Clover is pretty much gone, and she respects the hell out of him. It takes real guts to stand by your principles like he did. They aren't friends, far from it, but there is a certain level of understanding between them. Also, Undyne apologised for being an asshole during the peace talks.
Alphys: She isn't scared anymore, so that's good. She still isn't entirely comfortable being around Clover or any of the Sanctuary people, but it becomes easier every day.
Mettaton: He hates how Clover keeps stealing the spotlight from him without even trying. On the surface, Clover is constantly hounded by paparazzi, reporters, talk show invites and documentary offers. And he doesn't even appreciate it!!!
Sans: Still hasn't tipped him.
Asgore: The two have grown relatively close since the Barrier broke, at least as close as they could get. Asgore had asked Clover personally to testify at his trial. They talk whenever they can, and Clover had even confided in Asgore about Flowey's Resets since he's one of the few Monsters that know about the ability. Of course, Clover didn't tell him everything. The Vengeance Run is a secret he'll keep to his grave, and the fate of Asriel is not his story to tell.
