Summer Leonie

Weapon: Budding Bow+ (+Spd) / Spendthrift Bow+ (+Spd) / Sunflower Bow+ (+Spd)

Assist: Positional Assist / flexible

Special: Moonbow

IVs: +Atk or +Spd / -Res

Passive A: AR-D Atk/Spd / AR-D Atk/Def / Swift Sparrow 3 / Atk/Spd Push 4 / flexible

Passive B: A/D Far Trace / Lull Spd/Def / Lull Atk/Spd / flexible

Passive C: Fatal Smoke / Savage Blow / Def Smoke / flexible

Sacred Seal: Blade Session / Atk/Def Solo / flexible

• Leonie’s high Atk and Spd make her an ideal candidate for a player phase build. 
• There are many great inheritable bows available. Budding Bow+ is a particularly strong option on Aether Raids Defense, as denying a foe’s follow-up attack is extremely effective against many units. Spendthrift Bow+ provides a significant boost to Atk and bulk in all modes, and the Special cooldown loss after combat is generally not a large downside; Leonie usually prefers to use a 2 cooldown special like Moonbow that she can activate on her second attack within one combat. Sunflower Bow+ is also a good choice, as while it only boosts Leonie’s Def and reduces foe’s Def by 5, which is less than Spendthrift’s swing of 7 Atk and does not help her bulk against enemies that target Res, the additional effect of removing a foe’s Def buff and giving Leonie a Def buff equal to it can result in a larger overall gain. +Spd is a useful choice of refine in all cases, though +Def is also solid if Leonie is fighting opponents that threaten to KO her. 
• Moonbow is generally the best choice of Special, as mentioned above.
• The ideal choice of Assist depends on mode and team, but a movement assist like Reposition or Draw Back is useful in many contexts. 
• The ideal choice of boon is generally +Atk or +Spd. +Def is also a decent option if a bulkier Leonie is desired, especially considering that it (and Spd) are superboons. Leonie’s Res is poor, and Sunflower Bow+ does not help her bulk against magical foes unless they have a Def buff, so she loses little by taking -Res. 
• The best A skills are those that boost Atk and Spd, so AR-D Atk/Spd if used on Aether Raids Defense, or skills like Atk/Spd Push or Swift Sparrow in other modes. Note that Atk/Spd Push 3 only activates if Leonie is at 100% health and it deals her 1 damage after combat, so it is generally an inferior option despite being in her base kit. Something like Fury 3 is a more reliable budget choice. 
• There are several good options for B slot. A/D Far Trace debuffs foe’s Atk and Def by 3 while also allowing Leonie to use the remainder of her Mov after combat, if she did not use it all before combat. A Lull such as Lull Spd/Def can debuff a foe’s stats while also nullifying any buffs in those stats; Lull Atk/Spd and Lull Atk/Def are also solid choices, as Leonie appreciates debuffing all three of those stats. Something like Desperation can also be a solid budget option to allow Leonie to follow-up before her foe can counterattack if she’s below 75% HP. 
• Fatal Smoke is a highly useful C slot that prevents Leonie’s foe from healing during or after combat, and if she survives, applies a status to that enemy and other foes within 2 spaces that prevents healing until after that unit’s next action. Options like Savage Blow and Def Smoke are also solid options for doing slight damage to nearby foes after combat or debuffing those foes’ Def, respectively. 
• The ideal choice of Seal is one that increases Atk and Spd, or optionally Atk and Def. There are many such options. Blade Session provides the largest potential boost, starting at +3 Atk and Spd if no allies have already acted and capping at +9 to both if two allies have already ended their turns and are still present on the map. Atk/Def Solo is an alternative option for improving Leonie’s bulk; Atk/Def Form provides a slightly larger maximum boost if Leonie will be used in circumstances where there are several allies within 2 spaces. 
• Poison Strike could also be used in the B slot or seal to provide after-combat damage to Leonie’s foes, but it will only activate if she survives the combat, so it is less reliable with a weapon other than Firesweep Bow+. 

Weapon: Firesweep Bow+ 

Assist: No Assist / flexible

Special: Moonbow

IVs: +Atk or +Spd / -Def or -Res or -HP

Passive A: AR-D Atk/Spd / Swift Sparrow 3 / Atk/Spd Push 4 / flexible

Passive B: Poison Strike / A/D Far Trace / Lull Spd/Def / flexible

Passive C: Fatal Smoke / Savage Blow / flexible

Sacred Seal: Poison Strike / Blade Session / Atk/Spd Solo / flexible

• Firesweep Bow+ is a great option that denies counterattacks, allowing Leonie to attack without fear of retribution against any foe that does not possess Null C-Disrupt. 
• If used on Aether Raids Defense, the ideal choice of Assist will depend on the team composition. In other modes, a movement assist like Reposition or Draw Back is quite useful. 
• The ideal choice of boon is Atk or Spd; however, Leonie also functions fine at neutral, with no boon or bane. 
• Poison Strike is a great option for B skill and seal, as it allows Leonie to deal up to 20 damage after combat against a target she does not KO. A/D Far Trace debuffs foe’s Atk and Def by 3 while also allowing Leonie to use the remainder of her Mov after combat, if she did not use it all before combat. While the Atk debuff is generally not useful except against those rare foes with Null C-Disrupt, the movement effect is quite strong. S/D Far Trace would be a superior option, but does not exist at time of writing. Lull Spd/Def is another solid option that debuffs foe’s Spd and Def by 3 in combat while also nullifying any buffs they have in those stats. 
• The ideal choice of A slot is one that boosts Atk and Spd on player phase. The best choice will depend on what the player has available, and what context Leonie is used in. AR-D Atk/Spd is an extremely strong choice if she is used on an Aether Raids defense team, but useless in other modes. Options like Swift Sparrow 3 and Atk/Spd Push 4 are reliable in all modes. Something like Fury could also be used as a budget option. 
• The ideal C slot for Aether Raids Defense is Fatal Smoke, as it denies the ability for foes to heal during or after combat, while also applying a status on the foe and and foes within two spaces after combat that prevents healing until those units’ next actions, as long as Leonie survives the combat. Otherwise, options like Savage Blow or Def Smoke are great for providing extra damage to nearby foes, or debuffing their stats. 
• If Poison Strike seal is not used, a seal that boosts Atk and Spd is ideal, such as Blade Session or Atk/Spd Solo.