I feel I should start this of with letting you know that, in my mind, Dimentio and Luigi are BFFs (eventually).
Mostly because the two of them are my favorite Mario characters. I'm aware that it doesn't make all that much sense. But whatever.

I got these from this website : perchance.org/incorrect-quote-generator

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Luigi, at Dimentio’s funeral: I need a moment with them.
Everyone else at the funeral: Of course. *leaves*
Luigi, leaning over Dimentio’s coffin: Okay, listen here you little shit. I know you’re not dead.
Dimentio, sitting up in the coffin: Yeah, no shit.
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O'Chunks: Are you free tomorrow?
Mimi: No, I’m f--king expensive every day.
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Dimentio, to O'Chunks: You know, Mimi can be really aggressive, so it's important to take all the necessary precautions when approaching.
Dimentio: *blows airhorn at Mimi* GET F--KED!
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Mimi: Standing next to sunflowers always makes me feel weak like ‘look at this f--king flower. This flower is taller than I am. This flower is winning and I’m losing.’
Luigi: Wow, you are not ready to hear about trees.
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O'Chunks on Monday: *glues a dime to the sidewalk* Heh heh heh.
O'Chunks on Wednesday: *walking down the street* Ooh hey! A dime!
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Dimentio: Hoodie pockets are so great. I can fit like three sandwiches and a grenade in there and my hands are still warm.
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Luigi: Question. When they shot Bambi's mother, did you find that a sad moment...at all?
Dimentio: I'm sure she's mounted on a nice wall in a fine home somewhere.
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Dimentio: Hey, Luigi! Did you know your my BFFLWYLION?
Luigi: What the heck is that supposed to mean?
Dimentio: Best Friend For Life Whether You Like It Or Not.
Luigi:
Luigi: That’s one way to say it, I guess…
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Mimi: Honestly, I am so evil. So full of darkness. I feed off the souls of the living I strike fear into-
Dimentio: You sleep with a teddybear.
Mimi: He’s my sECOND IN COMMAND IN MY ARMY OF DARKNESS!
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Dimentio: *tapping fingers on table*
Luigi: *taps fingers back furiously*
Mimi: …What’s going on?
O'Chunks: Morse code. They’re talking.
Dimentio: -.-- ..- .-. / - …. . / -.-. ..- - . … - (translation: YUR THE CUTEST)
Luigi: *slams hands on table* YOU TAKE THAT BACK!
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O'Chunks: Luigi, I want Mimi gone ASAP!
Luigi: If you say so… wait, shouldn’t we get someone to help us?
O'Chunks: The only person that could help us is Dimentio and I don’t really trust them… *Looks over to Dimentio*
Dimentio: If you’re gonna hide a body, clap your hands! *clap clap* If you’re gonna hide a body, clap your hands! *clap clap*
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Dimentio: .. .----. -- / … --- .-. .-. -.-- (translation: I'M SORRY)
O'Chunks: What's that?
Dimentio: Remorse code.
O'Chunks: I'm even angrier now.
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Luigi: Hey, it’s your turn to wash the dishes.
Dimentio: I’ll wash the walls red with your blood.
Luigi: Okay, but before that, wash the dishes. Also, use soap this time.
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Dimentio: I made lightly fried fish fillets for dinner.
Luigi: Dimentio, It’s 1:15 am, what the f--k.
Dimentio: Do you want the lightly fried fish fillets or not.
Luigi: Well, I mean yeah.
Dimentio: So come downstairs while they’re still hot.
Luigi: Wait, you just made them?
Dimentio: Yeah, I wasn’t tired so I decided to make lightly fried fish fillets.
Luigi: Say lightly fried fish fillets one more time Dimentio.
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Mimi: Bet you can’t eat 15 crayons!
O'Chunks: Bet you I can!
Dimentio: *sips coffee, checks to make sure 911 is still on speed dial, and goes back to reading the paper*
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Dimentio: Clownery. Tomfoolery. Absolute f--kery, I am going to revoke your life privileges.
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O'Chunks: I am an expert at identifying birds.
Mimi: Okay, what about those ones flying over there?
O'Chunks: Yeah, they're all birds.
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Dimentio: Go ahead, O'Chunks. Let it out, cry. If you don't, your tear ducts will get blocked up, and then when you get old, you won't be able to cry.
Mimi: Just when we thought it was safe to let you back into the conversation.
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Mimi: Hey I just got a pet snake. What should I name him?
O'Chunks: A pet WHAT?!
Dimentio: William Snakespeare.
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This was random, I know.
If, by chance, you'd be interested in more, let me know.