Yeah, fair enough. Waifu reasons are plenty good reasons. Or I guess... unwaifu reasons here?
And allow me to correct myself: "But if you don't want Uriel, fine. Just know that you're making a mistake from a min/max standpoint, but fine."Just to note, Light is going to be absolutely crazy in the year to come. There's plenty of fantastic Light SSRs to MT right now (Michael, Tish) and every MT for the next year will bring some CRAZY good Light Hime into the tickets.
So from a min/max perspective, focusing on Light would be far better. Fire needs a secondary team to handle Water fights, and for worthy MTs Fire only has Svarog/Uriel, and maybe Mars/Amaterasu - the problem with these two is that their worth is entirely in their debuffs, and debuff doomsayers have a reason for their actions.
Just so that you know.Replacing Heph will be plenty possible starting from you having Herc Axe at 1-Star. It makes things a bit awkward, but plenty possible. Though, I wouldn't replace her until you have a SSR to replace her with.Honestly I'd say Mars > Amaterasu > Ares > Acala, but if you want, you can get them in another order for waifu reasons.
The bigger problem is that starting from next MT, you'll have better targets for MT. SSR Fire Amon is pretty good, I believe. Upcoming Fire Mammon might also be worth it. Vajaun/Vahagn might be in next MT as well, but if not, then in the one after that. To my understanding she's absolutely THE Fire Hime to get outside of Haruhi, but Haruhi won't be available in MTs.
Point being, if you want Acala in MT for waifu reasons, this might be your best chance. But if you don't have Mars, you'll struggle with debuffs.
And finally, please don't plan exactly for MTs. Only focus on the MT of right now. Sometimes, gacha goes crazy and gives you exactly what you want, after all. So yeah, leave your plans open.
On a side note, just to be sure, let me link this:
The encyclopedia in Sanahtlig's toolbox gives you a quick peek on all the upcoming SSRs.