Spring Camilla

• Preferred IV: +ATK or +SPD / -HP or -RES
• Weapon: Gronnblade+
• Assist: Reposition
• Special: Glimmer / Moonbow
• Passive A: Death Blow / Life and Death / Close Counter
• Passive B: G Tomebreaker / Vantage / Desperation
• Passive C: Threaten Res / Varies on Team
• Sacred Seal: Atk + 3 / Spd + 3

Gronnblade+ Camilla can essentially be run two separate ways: you can try to salvage her Speed, or you can try to maximize her Attack. With a Speed boon, Life and Death, Hone Fliers buff, and Spd +3 seal, Camilla will reach 43 Speed on both player and enemy phase, which can be further increased to 47 by running her with Goad Fliers teammate.  This means that she can be run similarly to Nino in that she can have high-damage doubling capabilities. Unlike Nino, Camilla suffers from poor Resistance, meaning that she'll have difficulty doubling mages without dying, particularly with a bane.

Alternatively, a +ATK, Attack seal, and Death Blow set means that Camilla will hit 60 attack on initiation, before any buffs. With full flier buffs included, Camilla will hit for a staggering 90 green magic damage, without factoring in things like unit support, goad fliers, or special proc. This makes her terrifying as a unit capable of oneshotting many other units.

Her B slot should be Desperation if you're building her out to be a speed demon- otherwise, it's a little more flexible. You can go for G Tomebreaker if you're concerned about high Resistance green mages such as Julia or Sonya, otherwise Vantage will help her out if she needs to bait units, particularly if you opt for Close Counter instead- this way, you can use your Blade Camilla on enemy phase, by luring out unsuspecting Lance and Axe units to attack into her high defenses and eliminating them with a massive blast of green magic. 

With the 2.0 update buffing Glimmer down to 2 ticks, it becomes ideal for Camilla to increase her already staggering attack potential. The cooldown addition to her blade tome puts it at 3 ticks, which is perfectly manageable if you need to build it up for a massive attack- though you'll rarely need to.

• Preferred IV: +ATK or +DEF / -HP or -SPD
• Weapon: Gronnraven +
• Assist: Reposition / Swap
• Special: Moonbow / Bonfire
• Passive A: Triangle Adept
• Passive B: Vantage / G Tomebreaker / Quick Riposte
• Passive C: Goad Fliers / Team Dependent
• Sacred Seal: Distant Defense 3 / Deflect Missile / Deflect Magic

While the introduction of Myrrh and Female Grima means that Spring Camilla's niche in being flier emblem's bow counter is mitigated, it doesn't invalidate the utility of the build.  This set allows her- unbuffed at no merges- to tank and counter kill an optimally-built +10 Reinhardt and +10 Lyn... in the same enemy phase. Gronnraven allows Camilla to function as if she has WTA against colorless, meaning that when combined with Triangle Adept, gives her a large damage reduction and increases her damage done where arrows are concerned.  This isn't just an anti-Reinhardt/BLyn set either: with this set, Camilla can kill most archers she comes across, as well as solidify her defenses against powerful blue mages that were once a threat to her.

Moonbow is required to kill Reinhardt and Brave Bow users, as she will proc it upon her first retaliation and typically oneshot her attacker. Bonfire can be run with more damage, but you run the risk of failing to ORKO and allowing the enemy unit to be danced or repositioned away.

Vantage is the ideal B slot if your primary focus is taking down baddies in Enemy Phase. After being attacked by any of her meta counters, Camilla will dispatch them and then be within range for a Vantage proc. Her high attack means that she'll be able to take down multiple enemy units in enemy phase with this, and if she has a Hone Attack, Goad Fliers, or Hone Fliers buff, she'll be able to eliminate a +10 Reinhardt / Brave Lyn combo in the same turn without dying.

She is capable of surviving without Distant Defense, however the margins for her survival there are more narrow, and it's good for insurance. She can work with another seal if your team is already using the DD seal.

• Preferred IV: +SPD or +ATK / -HP or -RES
• Weapon: Green Egg (+SPD) / Green Egg (+DEF)
• Assist: Reciprocal Aid / Reposition
• Special: Bonfire / Moonbow
• Passive A: Fury / Iote's Shield
• Passive B: G Tomebreaker / B Tomebreaker / Wings of Mercy
• Passive C: Goad Fliers 
• Sacred Seal: Spd + 3 / Distant Defense / Atk + 3

With the Weapon Forge in 2.0 comes a buff to Green Egg+, and with it, Camilla's ability as a generalist has increased immensely. Her ability to recover HP after every combat means that she can effectively run Fury while severely mitigating the HP penalty (losing -2 HP per round of combat).  In addition, her Egg can be forged to increase one of her stats. When combined with a +SPD IV, +SPD forge, +SPD seal and Fury, her speed stat can reach 37 before any kind of buffs (43 spd with a flier buff), making her far more capable of dueling units who could counter her.

An alternative to Fury is Iote's Shield, which can be used in place of her Gronnraven+TA build to allow her to similarly tank arrows with her large Defense stat and retaliate with a green magic blast.  If running Iote's then a +DEF IV, Distant Defense Seal, or +DEF forge on her Egg would be helpful, though all three might be overkill.

Her B slot is also variable, depending on what you want her to counter. G Tomebreaker helps her to be a more rounded unit, eking out wins against units like Cecilia and Julia, however B Tomebreaker is necessary if you want her to double units like Linde, Lute, or other high-speed blue mages.  Wings of Mercy is another option that allows her to function more as team support: she can use Reciprocal Aid to heal her teammate or blast away at whichever damaged them with her Green Egg.

Like other slots, her Sacred Seal can be alternated as well to best suit your preferences: this Camilla is versatile and can be very flexible to fill many teams depending on what kind of unit you need. She's also relatively budget-friendly, as all of her skills can be found on 3 star units and her highest cost investment would be forging her egg.