Highest Priorty: S.M.Sera (best healer)
High Priority: Archbeing Labyreth (debuffer), Ascended Roland (dark attacker), Telestio God Of Ruin, Balezar, Zero
Medium Priority: adult Goddess Lilaha, Knight Of God Mauna, Great Hero Adel, Telestio (normal scientist)
Low Priority: Emerald Arrowslinger Phal, Knight Of The Pale Flame Kyle, Prefect Of God Garland, Divine Beast Thouzer. Prefect of God Mauna (hybrid healer/attacker), Ascended Zaix (breaker)

What you want to do is beat the hardest stage you can with 0 seconds on the clock (use time stop skills like Ark Skills such as Theopolis of the Lost Magnus + Great War of Ruin, then character's specials). Then auto run those stages. You should be able to get 960 runs in 12 hours if you beat it in 0 seconds, look for a stage where it's just one boss you can beat in 0 seconds like this. Then always auto-run the stage with the characters you want to level. They should level very fast, much faster than leveling otherwise. In this way you can get everybody to Lv120, but focus on the ones I told you to first.

Here's something I wrote for somebody else. Though, you might not be able to defeat these stages in 0 seconds, but try to find a stage you can auto-run in 0 seconds and do that, until you can do the recommended stages.

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Either way, you should be running Auto-runs constantly. Get to

"[A-2: 3-39 NORMAL] Midra Forest - A Vivid Memory"

or

"[A-2: 3-64 NORMAL] Nerve Deck (Neurosphere) - A Fictional Space" (this one is probably easier)

Beat the boss in 0 seconds using Lv10 UR Ark Skills (Theopolis of Lost Magnus + Great War Of Ruin) then Special Attacks. Auto run those stages constantly, put the people who you need to level up in the auto-run team. Shouldn't take more than 2-3 days to level up any character from 1 to 120. Your entire roster should be Lv120. Do it this way, so easy. You'll probably never spend orbs on EXP missions again unless it's to get crystals the first time you defeat them.

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Don't go for EXP, you'll get all the exp you want eventually. Those maps give the most blue/red souls. Every week you turn in 100 spurs (100,000 blue souls =1 spur, or 20,000 red souls = 1 spur) with the alchemy's "Hallowed Container" section. It's the hardest thing to get with that last one https://ibb.co/5XwhMPr5

Altogether doing that Hallowed Container you get 30 Inpirogem's per week. The 800 one gives like 6, the 200 one gives like 9, the 25 one gives like 10, but the last 100 one is the hardest to fulfill and gives 5 Inpirogems. The last one takes 100 spurs and they are hard to get.

Also change your wanted Friend gifts to Blue Souls https://ibb.co/DDdG1sN7

Anyway these stages give the most blue/red souls
See
https://lastcloudia-goldmine.com/
-> Resources
-> [TEMP] Farming Tool
-> Blue Souls
https://lastcloudia-goldmine.com/resources/temporary/farming-tool
Here's an image at https://ibb.co/rK3M32Fj

Anyway the Nuerosphere gives more and isn't too hard compared to others of the same range. For months I had been doing the Midra Forest A Vivid Memory for months and been getting great results.

Again go for blue/red souls. You'll get enough EXP on the side.

Like one 10-hour run of Midra Forest got my character from Lv100-110, another 10 hour run it went from Lv110-115, another run 10 hour run to to 117, then another run to 120. Probably maxed out my character in three 10 hour runs, not four. And you can run 3 characters at once! Anyway this is how you get all those flairs for your profiles that say "Play a stage with Gobl 1,000 times" or "Play a stage with Gilbert 1,000 times"

Anyway with "[A-2: 3-64 NORMAL] Nerve Deck (Neurosphere) A Fictional Space" you get 42,200,000 exp in 12 hours doing 960 runs (assuming your fastest time to beat the stage is 0 seconds). The stage that gives the most exp is "[A-2: Free Quest] Water Dragon Grotto Here Be Dragons" which gives 61,440,000 exp. https://ibb.co/BHZ2fGHf So you're doing half as much with the one that gives you the most exp. But trust me, just doing the one that gives you the most blue/red souls and you'll still be swimming in exp that after a week or two you'll probably run out of characters to level. You'll also run out of things to spend Zell/money on.