LogFAQs > #910205167

Sure, that's possible. They would each mow down everything in their path until they met one another. After that, you'd have to guess which one is stronger.

Characters from mainstream competitive games (like D.Va and Draven) have the highest overall rally potential. With Melee vs. Undertale, we saw that a game which has been rallying for longer has an advantage - Melee didn't start rallying until round 4, when it needed that help to beat Chrono Trigger. That might have a slight impact on D.Va since she could potentially beat Aloy without needing to rally. Monika might have a slight advantage over Sans because her game is younger and hasn't won before.

All of those reasons are highly speculative, of course. There will be a lot of luck involved in predicting which rallies would win against others, just like there is for predicting which rallies will come to fruition in the first place.