@WiliamZero:
The WT of Leona's skill puts her at platinum rarity at the very most.
Aside from her skills or ability, her best feature is that she has significantly higher attack than Lian, who is pretty strong; Lian had a regular attack dps that's better than Plat Vampire Hunter Elizabeth.
My Lian is Cost 12, which is perfectly fine if Leona's initial cost is also 12 instead of 14 for anyone that doesn't have a Rear Tactician yet. I don't think anyone is going to need to trade rainbow crystals for additional copies of her, though a 9 cost unit that is significantly stronger than a premium plat vampire hunter's regular attack is quite broken.
Memo:
Emperor: HP2251; AT553; DF502; MR20; LV80
Sacred Treasure of Adamas (アダマスの神器): (30s; attack 2x; ranged true damage attack; once per battle; AS: ; WT: ; CT: )
Imperial Tactician Leona: HP1024; AT351; DF185; LV70
Bagua Formation (八卦の陣 ): (10s; all ally 75% attack nullification; skill expires: all ally HP recovery; AS: ; WT: ; CT: )
Imperial Heavy Infantry Dwight: HP2138; AT226; DF409; LV50
Recovery I (回復Ⅰ): (0s; same as Mischa's skill; AS: ; WT: ; CT: )
EDIT:
Leona's data has been extracted from the game's code with all three tiers of sprites (LV/CC/AW). Though, some of it seems like they copy-pasted her from Lian, and she doesn't have an AW Skill yet.
AW90 Stats (0% Affection): HP1468; AT310; DF197; Cost: 14 (Mincost: 9)
Affection: Attack 120; Defence 48
Ability: all members' defence +5% if Leona is a team member.