I always said would be Dorothy and Ruby, many reasons, 1st Mulan never was declared in show canon Bi or lesbian and after bc they have more freedom with Dorothy and Ruby that have no Disney live action movies coming, unlike Mulan and neither the other 2 have animation movies where they were given male love interests so Disney may not let them do that twist and show Mulan as a lesbian. Especially bc they never said in interviews that Mulan would be part of the lgbt couple.
I even say that since Mulan, Ruby and Dorothy wont appear past this epi, Ruby and Dorothy may end dying and they will parallel Hercules and Meg story epi, and will show them both together movin on to heaven, that will appear to have rainbows, lol.
"I offended you with my opinion? Ha, you should hear the ones I keep to myself".