Sure, in Undertale, nobody has to die. That doesn't mean they can't die, though.
NOTE: All spoilers are unmarked. You Have Been Warned.
Neutral Run (all deaths are optional)
- "Urgh... You are stronger than I thought... Listen to me, small one... If you go beyond this door, Keep walking as far as you can. Eventually, you will reach an exit. ASGORE... Do not let ASGORE take your soul. His plan cannot be allowed to succeed. Be good, won't you? My child..." - Toriel
- "You... ... at my most vulnerable moment... To think I was worried you wouldn't fit in out there... Eheheheh!!! You really are no different than them! Ha... Ha..." - Torielnote
- "Whimper." - Dogamynote
- "(I'll chop you in half!)" - Dogaressanote
- "ALAS, POOR PAPYRUS! WELL, AT LEAST I STILL HAVE MY HEAD!" - Papyrus
- "YOU! I had finally found the perfect body...!!! I even came to a secluded place to fuse in PEACE, but... I guess I made an ENEMY!!! Just WAIT! After I repair this body, you're REALLY going to suffer!!! Someday. Someday! SOMEDAY!!!" - Mad Mew Mewnote
- "I suppose I should have expected that." - Mad Mew Mewnote
- "Ha... ha... Alphys... This is what I was afraid of... This is why I never told you... No... No! Not yet! I won't die! NGAHHHHHHHH!!! I WON'T DIE! I WON'T DIE! I WON'T DIE! I WON'T..." - Undyne
- "B-but I never got to...!" - Tsunderplane
- "02... I never told him..." - Royal Guard 01note
- "02!? B-but why!?" - Royal Guard 01note
- "01...you...!..!!!!" - Royal Guard 02note
- "01...!? What the...!?" - Royal Guard 02note
- "Sorry." - So Sorry
- "I'll SPARE you now~" - Muffet
- "H.. ha... So I was wrong. Darling... You really are strong enough to get past ASGORE. Well then... It's time for you to go. Don't worry about me. I might seem like I'm dying now, but... Dr. Alphys can always repair me. And... besides... Even if I'm not cut out to be a star... I still got to perform for a human, didn't I? So, thank you, darling... You've been a great audience!" - Mettaton EX
- "G... GUESS SHE SHOULD HAVE WORKED MORE ON THE DEFENSES... YOU MAY HAVE DEFEATED ME... BUT... I KNOW. I CAN TELL FROM THAT STRIKE, DARLING. YOU WERE HOLDING BACK. YES, ASGORE WILL FALL EASILY TO YOU... BUT YOU WON'T HARM HUMANITY, WILL YOU? YOU AREN'T ABSOLUTELY EVIL. IF YOU WERE TRYING TO BE, THEN YOU MESSED UP. AND SO LATE INTO THE SHOW, TOO. HA... HA. AT LEAST NOW, I CAN REST EASY. KNOWING ALPHYS AND THE HUMANS WILL LIVE ON...!" - Mettaton NEOnote
- "Please... Young one... This war has gone on long enough. You have the power... Take my soul and leave this cursed place." - Asgore Dreemurr
- "After everything I have done to hurt you... You would rather stay down here and suffer... Than live happily on the surface? Human... I promise you... For as long as you remain here... My wife and I will take care of you as best we can. We can sit in the living room, telling stories... Eating butterscotch pie... We could be like... Like a family..." - Asgore Dreemurrnote
- "No. That's just a fantasy, isn't it? Young one, when I look at you... I'm reminded of the human that fell here long ago... You have the same feeling of hope in your eyes. There is an ancient prophecy among our people... One day, a savior will come from the heavens. ...I believe the one that was prophesied was you. Somewhere in the world outside... There must be a way to free us from our prison. It pains me to give you this responsibility, but... Please. Take my soul... and seek the truth. Ha... ha... I'm sorry... I couldn't give you a simple, happy ending... But I believe your freedom... is what my son... what ASRIEL would have wanted." - Asgore Dreemurrnote
- "I knew you had it in you!" - Flowey
Genocide/No Mercy Run
- "Y... you... really hate me that much? Now I see who I was protecting by keeping you there. Not you... But them! Ha... ha..." - Toriel
- Did something move? Was it my imagination? I can only see moving things. H...hey i can't stop shivering all of a sudden. Who... who's there!? - Doggo
- "W-WELL, THAT'S NOT WHAT I EXPECTED... BUT... ST... STILL! I BELIEVE IN YOU! YOU CAN DO A LITTLE BETTER! EVEN IF YOU DON'T THINK SO! I... I PROMISE..." - Papyrus
- "This... This feeling...? Eureka. Eureka! EUREKA! Human. That moment of unbridled emotion. It allowed me to finally fuse with my body! I'm fully corporeal now! My lifelong dream, realized! In return, I guess I won't stomp you. How's that sound?" - Glad Dummy
- OK! - Glad dummy if you wait 5 turns
- "Damn it... So even THAT power... It wasn't enough...? Heh... Heheheh... If you... If you think I'm gonna give up hope, you're wrong. Cause I've... Got my friends behind me. Alphys told me that she would watch me fight you... And if anything went wrong, she would... evacuate everyone. By now she's called ASGORE and told him to absorb the 6 human SOULs. And with that power...This world will live on...!" - Undyne the Undying
- ...you're here. so that means Undyne... She's... Like, Undyne! we'll avenge you! - the Royal guards
- "Did you hear what she said? They said a human wearing a striped shirt will come through. I heard that they hate spiders. I heard that they hate everybody. I heard that they like to tear their legs off. I heard... That they have some awful taste. What a shame. A human comes through and they aren't even fit to be eaten~ Oh well! Rotten ingredients can always be discarded~" - Muffet
- "Huh? A telegram from the spiders in the RUINS? They say even if you are a hyper-violent murderer... You never laid a single finger on a spider! Oh my, this has all been a big misunderstanding~ I thought you were someone who hated spiders~ The person who warned me about you... They really had no idea what they were talking about~" - Muffetnote
- "GH... GUESS YOU DON'T WANT TO JOIN MY FAN CLUB...?" - Mettaton NEO
- "so... guess that's it, huh? ... just... don't say i didn't warn you. welp. i'm going to grillby's. papyrus, do you want anything?" - Sans
- "Why... you..." - Asgore Dreemurr
- "See? I never betrayed you! It was all a trick, see? I was waiting to kill him for you! After all, it's me your best friend! I'm helpful, I can be useful to you, I promise I won't get in your way, I can help... I can... I can... Please don't kill me." - Flowey
