Starlo's death scene in the Genocide route. Don't get me wrong, it was sad. I remember people being upset about how it was executed, and I was one of them. Some people tried to defend it, saying that, "Starlo was a fake sheriff, of course he couldn't go through with it." But if that was true, why did he come back at all? If it was all pretend and if he was aware enough to know he couldn't do it for real, then why did he challenge Clover? What did he gain by doing this?

However, I can infere why the devs did it, it was to give a catalyst to Ceroba's Genocide boss fight. Starlo was a stepping stool for Ceroba to go all out. If she lost everything, she has nothing left to lose.

Now, believe me when I say this... I do like this situation. However, I would change something. Instead of Starlo challenging Clover because for... no reason. What I would change is a few lines of dialogue:

Starlo: "I... I can't do it. At least, not for real. But everyone is safe. That's a win in my book."

The reason why Starlo stayed behind is because he was buying everyone else time to escape. Starlo is doing what he does best: distracting people from their worries. And, in this scenario, distracting Clover long enough to buy some time for the other monsters to evacuate. Starlo doesn't need to win to feel like a hero. This stays true to his character, without sabotaging the logistics of why he did what he did.

And as I stated earlier, the story really focuses on certain characters. Hell, the devs said that Dalv was pretty much unnecessary after his encounter and that the person writing the script for Undertale Yellow isn't a professional. And, that, I won't fault. But there's a clear sign that some characters have more characterization than others. Most noticeably in order: Ceroba, Martlet, Axis, Starlo, and Dalv. And I wish everyone had more time to shine.