Okay question guys which Matchup you want to have a emotional ending?
Kasen Ibaraki vs Fleetway Sonic could vary in a lot of different ways in terms of ending, it could potentially do an emotional one, though.
My personal way for how I'd have the fight end would be to, after the full fight is occurred, they fought in their original forms, then eventually both bring out their psycho alter egos and brawl for a while, before bringing the fight into Hell. From there, Super Sonic ends up slicing her arm off, which reverts Kasen back to base form. Right before SS can go for the kill, she calls back her prosthetic arm, and tears Super Sonic's soul out of his body, before crushing it with her hand, completely obliterating it and removing it from the reincarnation cycle, killing him... however, Sonic's body falls to the ground, bringing Fleetway Sonic himself back to consciousness, in full control of his body and no longer haunted by his alter ego, as Kasen destroyed ONLY SS's soul. They then end up gaining a lot of respect for one another, having inadvertedly solved one another's biggest problems.
However, since Death Battle NEEDS to kill someone, you could have a potentially emotional ending with Kasen being forced to kill Sonic once she's brought back to base form, apologizing as she essentially puts him out of his misery due to losing control to the alter ego.
Alternatively, if they both stay in their evil alter egos for the fight finisher and kill, neither would really have any remorse for their actions lol.
As Fuji said, Simon v Kyle and Yukari v Altair could also have emotional endings.