Tempest Trials - Dark Clouds Over Awakening

Roy's natural Triangle Adept helps him take multiple hits from Veronica and allows him to get close to Veronica to kill her. He is also effective against most green units that may appear. Liliana is taken due to the large amount of greens you are able to face and her natural base damage. Personally, I also have Triangle Adept 3 on her as well to tank more and deal more to greens. However, Lilina can be substituted for other red mages like Tharja or Celica. Next is Ursula who is taken due to her Blarwolf's effectiveness against calvary units such as Cain and Stahl. Tempest trial always has two calvary units to fight against, which makes Ursula's tome highly useful. Lastly is Julia. I like Julia due to her natural high magic resistance and high attack. The rightmost unit on the map tends to be Cecilia, Olwen, or Reinhardt. Julia can one shot Olwen and Reinhardt, and she's able to tank and return damage to Cecilia without being one-shot. However, sometimes the rightmost unit may be Leo, which I have Ursula available to ORKO. Additionally, I recommend taking mages because the final map has one armored unit who spawns in four units above the second-to-last on the right of ally units. Armored units have natural low resistance, thus making mages very useful.

(Disclaimer: This is gonna be long ?)
Stats and skills for each char listed below~ (skippable)
Nino: +SPD -RES (4 star not merged)
Hp:31 Atk:42 Spd:40 Def:19 Res:23
Weapon->Gronnblade
Assist->Draw Back
Special->Luna
A->Fury 2
B->Desperation 3
C->None(possibly Fortify Defence)
Sacred Seal->SPD+1
Role: Main damage dealer
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Nowi: +RES -SPD (5 star not merged)
Hp:45 Atk:45 Spd:23 Def:30 Res:30
Weapon->Lightning Breath+
Assist->Reposition
Special->Bonfire
A->Triangle Adept 3
B->Quick Riposte 2
C->Hone Attack(might switch)
Sacred Seal->Fortify Res 1
Role: Support/Semi Tank
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Kagero: +ATK -DEF (5 star not merged)
Hp:31 Atk:48 Spd:36 Def: 15 Res:24
Weapon->Poison Dagger+
Assist->Rally Defence
Special->Astra(?)
A->Life and Death 2
B->Vantage 3
C->Hone Spd 3
Sacred Seal->Atk +1
Role: Secondary damage dealer
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Olivia: Neutral IVs (4 star +1 merge)
Hp:35 Atk:34 Spd:32 Def:24 Res:23
Weapon->Ruby Sword
Assist->Dance
Special->(None)
A->(None)
B->Escape Route 2
C->Hone Atk 3
Sacred Seal->(None)
Role: Dancer&Green Check (albeit a mediocre one)
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Gameplan (Stages 1-6): So what I always do in my runs is make sure Nino deals with the early couple of stages and lose HP without fear of retaliation from enemies that she will OHKO. I dont heal her up as much, mainly because she is alot more capable of killing alot of units with Desperation active. (she'll always have 1 HP at the last stage) Kagero is going to be the staff/high res unit killer and she can kill any unit Nino miiight not have a good shot with. (mainly red units or pegasus knights) Kagero can also buff Nino with a +4 in Hone Spd and Rally Def if she doesn't want to pick a fight~.(and basically kills every thing if an astra activates execpt armored units) Nowi is the bonus unit on my team and can check reds without an issue at all. As well as being able to kill the right side horse mage (execpt Cecilia but thats something else) if Ignis can activate which is guaranteed on the first fight or Nowi's counterattack. Olivia is the dancer of the group and allows Kagero specifically to 2 round units if she is unable to double them. Olivia can also check green units decently, although she isn't complete so she doesn't serve that purpose just yet. This team is basically a Semi Aggressive team that won't rush right in unless they can kill anyone that stands in their way, and only Nowi is capable of tanking a couple of hits. Which makes this team squishy with Kagero and Nino with very low defences.
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Final Map(Stage 7): For this part it can be a little tricky to deal with, because if there are many reds there it'll be a cake walk with Nowi there. If there are some blues though it requires a little more positioning and more caution. (i literally hate Peri with a passion here) Now if there are alot of Greens...thats when this team falls apart, Cecilia specifically in the final map is a bane for this team. Nowi isn't able to bait her, Kagero loses because of Gronnraven, and Nino can't exactly ORKO her, Olivia could be able to kill cecilia but she isnt able to safely with what she has now. Hector can be taken out easily unless he has Wary fighter, which is god awful. Titiana has great Res and Spd to not get doubled by Kagero and cant die to Nino, again Olivia could kill her but she wouldn't be safe if she tried.
Veronica herself is pretty awkward to deal with. Kagero can 1 shot her with an attack buff and an astra to score the kill, Nino with Luna and 2 buffs at least can ORKO her as well. Nowi could be considered dead weight actually if the final map doesn't have any Reds.
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Overall if i feel like Kagero can be switched with a strong Red Sword or Mage in order to check Greens and Veronica easier(about 4 options, theres choices ?) as well as putting an Archer such as Bridal Cordelia or Setsuna.
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This is such a long explanation on a team for something that lasts about 2 weeks, although i feel like SOME sort of explaining should be on each of the teams here ? or even just skill sets to make each team look more efficient and proper, and not have people wonder what each unit has in their skill slots. Ok thats all~♡

In short, this team revolves around using Azura to sing for Ike or Reinhardt. Hector helps with any pesky Blue units that could kill Ike or Rein, and can be used for bait on Veronica for her -6 chip damage from fury. Use Ike and Azura's sing to easily kill off Green units and Veronica.
Reinhardt - +ATK/-SPD
Dire Thunder
Reposition
Draconic Aura
Death Blow 3
Lance Breaker 3
Threaten Res 3

Ike - +ATK/-RES
Ragnell
Reporical Aid (Aether regains any of his lost HP, and can be used to help give any unit HP back)
Aether
Heavy Blade 3
Vantage 3
Threaten Def 3

Azura - +ATK/-SPD
Brave Lance+
Sing
Moonbow
HP+4
Wings Of Mercy 3
Fortify Res 3

Hector - +ATK/-RES
Armads
Pivot
Ignis
Distant Counter
Vantage 3
Hone Atk 2

tl;dr
Use Reinhardt and Ike to deal with any units, have Azura use to sing on them for cleanup kills, and use Reinhardt's reposition to save units. Use Hector as bait.

Just get Marth, Azura and either Robin or Julia to the end (preferably both). Azura for dance kills, Robin should be swordbreaker for guaranteed sword kills, Julia with bowbreaker to make her more effective and Marth for making sure Veronica dies in the final fight

Ryoma: Great frontline unit that can tank damage and keeps a check on most green units and can help take down Veronica (and many of the physical Calvary units on the left side) during the final battle.

Celica: Great offensive unit that can erase a lot of the roster thanks to her Ragnarok tome and LnD 3. Can easily duel Veronica if Celica has at least 30 health (assuming Celica has neutral Resistance). Can also be used to kite the armored unit in the final battle and destroys Hector should he appear. Also functions as a Pseudo Healer if you're using Renewal and Reciprocal Aid. This allows Celica to effectively heal the entire team before engaging the enemy team on most maps that aren't the final battle.

Takumi: Fulfills his role as a source of neutral damage and check on all fliers that don't have Iote's Shield equipped. He is crucial in the final fight because he can effectively duel Reinhardt and kite armored units (as long as they aren't Hector, but Hector shouldn't be a problem as long as Celica and/or Ryoma survived).

Azura: Takes low to no damage from all red units due to her Sapphire Lance, working as an effective counter to Red units. Has Sing, allowing for great mobility around the maps or the ability for a unit to retreat after attacking. Great coverage is granted by Wings of Mercy 3 as it allows for another unit to retreat via Sing or for her to finish off the unit that the other unit was fighting.
NOTE: Keep away from ALL green units. Most physical green units will be able to flat out kill her due to her only semi-decent defense and severe color disadvantage. She will be able to survive attacks from a few green mages due to her high resistance, but it's best to still keep her away and deal with greens with either red unit.

Strategy for Final Battle: I usually send Ryoma up the left side with Celica close behind because he can deal with many of the units that appear on the upper left side and Celica stays behind him to decrease some of the damage he takes through Spur Def 3 and the Spur Def 1 seal, and to finish off any unit Ryoma can't kill. Azura stays behind with Takumi to kill the Calvary Mage on the right side. In the case of Reinhardt or Olwen, wait until they come into the range of Azura and Takumi and then engage them. Dire Thunder will likely kill either of them if you're not careful. Leo can be killed if you just bait him out with Takumi. Celicia can be killed with Celica or Ryoma if you bait them. The armored unit should be left to be taken care of last. Veronica can be taken care of with Celica alone if she has a high enough health total. Veronica's body guard can be any Infantry Ranged Unit so it's best to just take them out with whatever unit works against them best. The armored unit can be killed through kiting and Hector can be killed through Celica and/or Ryoma after healing up because they should be relatively low after their battles.
NOTE: This strategy won't succeed if any of this team dies before the Final Battle. It is also possible to be screwed over by skill variance i.e. Reinhardt having Distant Defense could be a problem because it reduces Takumi's damage against him by 12, which could be disastrous. It is to be noted that a unit will always have their base kit plus random skills in the empty slots. For example, Leo will always have Brynhildr, Quick Riposte, Blazing Light, and Savage Blow.

I've found this team composition and strategy to be very successful in my Trials, but it could vary between people. Thanks for reading this far and I hope this helps whoever tries it out.