A Silly Pros and Cons Thing

The team I'm currently using to clear a lot of PvE:

Marth:
Pro: buffs and heals, incredible support unit
Con: so-so in combat. So I don't use him much for that.

Felicia:
Pro: fun to use, KOs Cherche and Lukas despite their massive def and HP stats, debuffs everyone, growing wind is kind of funny and it works
Con: having issues doing enough damage. Not good when PvE units have about 50% HP than they're supposed to and Nino has her way outmerged. Even Reinhardt tends to survive two hits thanks to his mixed bulk, which is kind of funny but still sad.

Nowi:
Pro: tanks everything, sustains like a boss
Con: not too great against mages, especially when my best IV is +spd -res.

L.Hector:
Pro: Thunder Armads is cheap as heck. Throwing out enemy doubles without losing my own is an improved inverse of that ridiculous thing called bold fighter.
Con: not so great against mages and mobility issues as soon as he drops below 100%HP

I'll only do 3 units cause I'll use my arena core.

Fir:
Pro: Wrath boosted Aether packs a serious punch, seriously who wants to face that blade in Wrath range.
Con: We don't have a deal with it glasses accessory. Okay actually sometimes she fails to one round dragons she baits, seen a couple Fae barely live when Fir has baited her.

Catria
Pro: She breaks swords in half like it's nothing.
Con: If she isn't fighting a sword or doubling a unit, she's not liking not killing and is very reliant on close defense for not taking a lot of damage.

Fae:
Pro: A good dargon that helps her Binding Blade buddy Fir by dealing with those nasty blues Fir doesn't like.
Con: She can struggle to handle some B!Lyn's depending on the build, and she's very reliant on baiting to do the majority of her damage.

Bonus Unit:
Pros: bonus arena points
Cons: If it's an infantry bonus unit then Catria can't run Atk Tactics :(

Saizo
+ he has incredibly defined pecs, which turn him into a defensive wall
- he dies to a single magic hit

Marth
+ Yuri Lowenthal
- none

Nowi
+ she's pretty strong
- her art is incredibly ugly (especially the damaged art)

Soren
+ owltome playstyle
- owltome playstyle

I'll give it a try with my Arena core:

Hana
+ Can K.O. mostly any Armor that doesn't carry Wary Fighter, even when she is outside her Brazen + Desperation range (she becomes an absolute killing powerhouse when she falls below 75% HP), and has enough bulk and Spd to almost never be one-rounded
- Pretty frail against physical attacks and is completely screwed against Effie with Wary Fighter and over 50% HP (surprisingly, my Hana can kill Nowi if Hana can bait her out, but it takes 2 Phases to do so)

Nino
+ Can run a Gronnblade set with amazing killing potential, or a Gronnowl set to tank much better on Enemy Phase than people give her credit for, while still retaining a good amount of power and bulk on Player Phase
- Can't run both sets at once, so sometimes I forget which set she has equipped and I accidentally get her killed or find that I don't do enough damage to one-round some units (Don't do your Arena runs brain-dead, kids!)

Nowi
+ Amazing mixed bulk that can deal with stuff like Reinhardt and Bold Fighter Zelgius (without running Guard because I'm too poor to give her Guard 3)
- Dies to Brave Bow+ B!Lyn with Horse buffs (otherwise, she could avoid the quad and doubles on retaliation), though Gronnowl Nino can tank this variant and then kill her

Here is my team weakling, just for fun

Eirika
Pro greatly improves everyones performance
Con weak as hell thanks to iv

Finn
Pro can ORKOH and can quad abusing brash assault, also builky
Con sometimes hits like a wet noodle against high def enemy

F!Grima
Pro fairly tanky and hard hitting, targets res instead of defence
Con reliant on support too much, without it she can hardly do anything

Inigo
Pro great B Lyn and Rienhardt counter, can dance
Con weak against anything not blue

Eirika
Pro: Stats can stack to very high levels
Con: She never f*cking comes home so i’ll never be able to finish her >:(

Fae
Pro: Balanced, hard to find a weakness when all stats are around 40 after tactics buffs
Con: Falchion. Nuff said

Effie
Pro: Tanky and hits like a truck; Even does well against mages with Berkrap’s Lance+
Con: Slow as sh#t and needs to use Wary Fighter to avoid doubles

Nanna (not in arena, for PVE content)
Pro: My only healer that doesn’t suck and can reliably run Wrathful staff, can debuff with Slow+
Con: Anything mildly sharp kills her, oh my fuckin god she fuckin dead

Cool didn't know it was possible to post a blank message.

Nephenee.
Pro: Cornerstone of my team and can 1v1 almost everything.
Con: Didn't get dc/wishblade as a refine so shes stuck at melee range.

Palla.
Pro: Jack of all trades.
Con: Master of none.

Bridal Sanaki.
Pro: She 1v1's most zelgius' in the arena for fun.
Con: Has a res bane instead of hp.

Olivia
Pro: has monstrous attack capabilities for a dancer thanks to Wo Dao/Moonbow. Can ORKO super bulky greens like Hector and M!Grima on either phase.
Con: dancer bst and is merged 4*+10 so has no hope of rising higher.

Nino
Pro: is Nino, her nuking ability is practically unparalleled. Plus at a 4*+10 merge and with Fury she has enough bulk to tank blue and some green mages, and can *usually* even take a Mulagir to the face if she's at full hp.
Con: DC users wreck her before desperation is active.

Fjorm
Pro: Thanks to Ice Mirror and Atk/Def bond she makes a pretty good mixed tank, plus with her DC weapon and the QR seal she gets a *lot* of enemy phase ORKOs.
Con: Has 31 speed. Without (and sometimes even with) a speed buff she gets doubled a *lot*, and while she can survive doubles from a lot of units, they generally drop her out of QR range.

Arvis
Pro: is an absolute fucking badass. Seriously, Arvis is just the best. He has almost unparalleled debuffing abilities, incredible sustain, can facetank a hit from practically any mage and shrug it off like it's nothing, and has a monsterously powerful iceberg for when he needs to nuke something. He is the best debuffer/combat medic/res tank/secondary mage nuke that I could ever ask for. And specific to this team, he really helps mitigate Fjorm's weaknesses, because he can debuff enemies before they attack her and then heal her up afterward to keep her in QR range. Plus if there's any green mage she's feeling scared of Arvis will eat them for breakfast.
Con: Recover Ring is only worth 200 sp. I don't understand why this isn't a 300 sp skill. I could run him with the unquestionably worse renewal 3 and get a better arena weight for it, and I just don't understand. Yes, I realize my team has a lot bigger problems that could be addressed if I wanted to raise their arena weight, but Arvis is otherwise perfect and so this is the only thing I have to complain about. ;)

Arena core

A!Tiki+10:
Pro: Even lance users need their special to put a dent in her. Aether lets her stay healthy and Atk Smoke lets her tank the next enemy better.
Con: Magic still takes her down, even strong greens that aren't Naga if they survive her counterattack.

Cordelia+9:
Pro: Firesweep, L&D mean she can double everything she comes across and can't be hit back. Can destroy any low Def mage that may threaten Tiki and soften up greens like M!Grima for Tiki to OHKO.
Con: No enemy phase threat, though she can still take a hit from reds.

Rhajat+6:
Pro: Can kill Reinhardt and Brave Lyn in one turn. G. Tomebreaker lets her kill opposing green tomes to save risking Tiki.
Con: If she isn't attack cavalry or a green mage, she isn't very useful apart from Rally Atk/Def

This isn't a purposefully designed arena core, simply the highest scoring units I have. Camilla will eventually replace Rhajat so:

Camilla:
Pro: Good mixed tank and excellent buffer with her refine.
Con: Would need DC to be a proper mixed tank but I like her being player phase with Swift Sparrow and Desperation.

Marth:
-Pro: Awesome support unit, destroy dragons
-Cons: Weak compared to other sword units

Soren:
-Pro: Chill atk, Owltome effect can make hima beast in battle
-Cons: Requires set up to shine

Kagero:
-Pro: With brazen atk/spd and barb shuriken she can deal serious damage and debuff the enemy
-Cons: Needs to be with HP<=70% to do her best

Corrin (f):
-Pro: She can take hit from units like effie, zelgius, ayra,soleil, etc... like those were nothing, with guard she can laugh at enemies that need specials to deal damage.
-Cons: Mages

Legendary Ike
Pros: Can tank and two shot pretty much everything on enemy phase ...
Cons: ... except blue mages, despite being +5 Merged and my Summoner Support.

Performing Azura
Pros: Urdr. Also can kind of handle Blue melee units.
Cons: Currently -Spd and -any defensive bulk regardless of IVs.

Legendary Lyn
Pros: Hits fast and hard; has fantastic burst damage thanks to Dragon Fang + Heavy/Flashing Blade Seal. Somewhat saved by Desperation.
Cons: Has next to zero enemy phase presence. Wary Fighter is her mortal enemy.

Micaiah
Pros: Hits hard and hits the meta harder. Also has phenomenal enemy phase magic bulk, even handling Green Tomes decently well.
Cons: One hit wonder due to lowish speed, despite being +Spd. Also explodes to nearly any melee unit that looks in her direction.