Lena

• Due to her good Attack and status as a healer, Lena can take advantage of the Wrathful Dazzling combination healers enjoy in order to simultaneously become a potent attacking and support unit. Her choice of weapon largely depends on what the team needs, as Staff users also have a wide variety of fantastic weapon choices, such as Melancholy, Gravity, and Pain. Also note that what weapon refine Lena uses is largely dependent on whether you have the Wrathful Staff or Dazzling Staff B slot skill, as the Wrathful Dazzling combination is achieved regardless of whether the staff user has the Wrathful Staff B slot skill and Dazzling Staff refine, or the Dazzling Staff B slot skill and a Wrathful Staff refine.
• For Lena’s assist, Restore is a standout choice as it allows her to heal a good amount of HP as well as remove any Debuffs from the healed ally, making it very useful against debuffs in general. It’s less effective against debuffs that refresh themselves every turn such as Sabotages or Aversa’s Night, however. Physic can also be a useful choice to give Lena’s healing extra range while allowing her to stay out of danger.
• While Lena’s Speed is easier to save than the likes of Rhys thanks to her access to a Speed asset, it’s often better to invest in her Resistance and Attack. As such, Atk/Res Solo and Atk/Res Push are great choices for her as they increase her best stats. If desired, however, she can also utilize Atk/Spd Push in conjunction with support from allies and a Speed Asset to avoid follow-up attacks and perform them more easily, although her ability to perform them against high Speed foes will still be limited.
• Joint Hone Attack allows Lena to further support herself and her adjacent allies with an additional +5 Attack at the start of the turn. As an infantry healer, Lena can also take advantage of Time’s Pulse to have an instantly charged Buffing Balm, allowing her to continuously buff her allies every time he heals them. 
• Finally, Live To Serve gives Lena some additional sustain should he be forced to tank a hit, while Atk +3 grants her a simple stat buff.

Weapon: Dazzling Kumade+

Assist: Restore+ / Physic+

Special: Windfire Balm+ / Miracle

Passive A: Fort. Def/Res 3 / Atk/Res Bond 3

Passive B: Chill Atk/Spd 2 / Chill Speed / Chill Atk

Passive C: Time’s Pulse / Preference

Sacred Seal: Chill Def / Chill Res

• Lena can also utilize the Kumade alongside other Chill Skills to become a potent support debuffer who can weaken foes significantly from a distance for her allies.
• Fort Def/Res 3 is a superior A slot skill for this build’s more passive playstyle, but Atk/Res is an alternative option on a budget. For Lena’s B slot and sacred seal, she’ll want two different Chill skills, such as Chill Atk/Spd 2, Chill Spd, and Chill Atk to hit as many opponents as possible with debuffs, although in some cases all Chills hitting a single foe is unavoidable.
• Finally, Time’s Pulse once again makes an excellent combination with a buffing Balm for further passive support, but Miracle and an alternative C slot skill can be used instead if desired.