Shayna+ Final Route aka "Tifa" Route(Mobility + Strike Buff/Debuff + CT based Shura)

Notable changes:
1. 0.85 * (PATK + AGI / 2 + AGI * Level / 100 + DEX / 4) -> 1.25 * (PATK + AGI /2 + AGI * Level/100 + DEX /2) (Yna Ku/Iena Ku Based)
2. Even uses Cestus/Gauntlet, Shayna in this "+" will attack use her feet, as her stance suggests that she is a feet based fighter
-On another note: Shayna is more "Tifa"-based than "Chun Li"-based, IMO, Tifa still has few hand based attacks.

1. Focused Palm -> Charming Arrival
After moving, inflicts Strike Attack, CT -40 to enemy unit, inflicts Paralyze
Range: 4
Height Range: 3
Scaling: 1.5*PATK
Multiplier: 180%
Paralyze: +100
Turn Count: 3
CT(Target enemy): -40
Jewel Cost: 12
Use: 3

2. Palm Shockwave -> Lovely Charm
3-hit penetrating Strike ATK to enemy units in the area, chance of critical, penetrating, Permanently increase own Strike ATK Power(Stackable, x3)
Range: 3
Area: (Proposed: 3x3 Cross, Optional(If NERF needed): this can be abandon and treated as ST)
Height Range: 2
Scaling: 1.5*PATK
Multiplier: 100~130%
Combo: 3
Strike ATK Power: +10~20
Jewel Cost: 15
Use: 3
(This is taken from Laura's MATK stacking x3 for 3 turns but changed into Strike ATK Power, stackable x3, and permanent since this is a J+)

3. Supreme Battle Trance -> Lovely Battle Trance
After Moving, inflicts 5 hit Strike ATK, chance of critical to single enemy unit, Ignores DEF, CT+30 to self, Very Strong vs Human, Slightly Raises Power when target has Strike res reduced
Range: 7
Height Range: 3
Scaling: 1.5xPATK
Multiplier: 250%
Combo: 5
Strong vs Human: +50
Tokkou: +50
Condition: Strike Res Debuff
Ignore Defense Rate: -100%
CT: +30
Jewel Cost: 45
Use: 3
-Overlord Battle Trance -> Flawless Cuteness: After Moving, inflicts 5 hit Strike ATK with chance of critical to single enemy unit, CT+50 to self, Ignores DEF, 100% Hit, disable all reactions, Powerfully Strong vs Human, Raises power when target has Strike res reduced
Range: 7
Height Range: 3
Scaling: 1.5xPATK
Multiplier: 300%
Combo: 5
Tokkou: +80
Condition: Strike Res debuff
Strong vs Human: +120
Ignore Defense Rate: -100%
CT: +50
Jewel Cost: 35
Use: 3
(Taken from Neun but make it Original and more "Shayna" like with its 5 hit)

4. Susano'o -> Charge of Cuteness: Quadruples PATK
PATK: +300%
Jewel Cost: 20
Use: 3/3(could be: 5/5)
(Could be Optional, or this skill instead)
4b. Susano'o -> Absolutely Unforgivable: Quadruples PATK and slightly raises PDEF/MDEF for 3 turns
PATK: +400%
Water DEF: +15
Jewel Cost: 20
Use: 3/3(could be: 5/5)
(Xeno Water Floor 15 Shayna)

5.Strike Mastery+2 -> Charming Power
Greatly Raises Strike ATK Power/PATK, Raises AGI
Strike ATK: +30
PATK: +25%
AGI: +10%
(What ever... There is Neun with his G2, why not?)

6. Whirlwind Kick -> Lovely Kick: Strike Attack to enemy units in the area(Strong vs Fire), Very Strong vs Human, Reduces enemy CT by Half
Area: 5x5 diamond
Range: 5
Height range: 3
CT: -50% of current enemy CT
Scaling: 1.5xPATK
Strong vs Fire: +50
Strong vs Human: +80
Multiplier: 160%
Jewel Cost: 35
Use: 3
(My Original proposed move since beginning along with Palm Shockwave+)

7. Divine Battle Trance -> Warm Up Combo
Strike attack on single enemy unit that knocks back enemy one square and raises own strike attack power for 3 turns and change to Opening Strike for 1 turn
Height Range: 2
Strike ATK Power: +50
Scaling: 1.5*PATK
Multiplier: 140%
Jewel Cost: 32
Use: 2

Combo 2: Opening Strike
Strike attack on enemy unit that lowers strike res for 3 turns, and change into Full Blown Kick for 1 turn
Height Range: 2
Strike Res: -30
Scaling: 1.5*PATK
Multiplier: 180%
Jewel Cost: 32
Use: 2

Combo 3: Full Blown Kick
After moving, water strike attack on enemy unit and knock backs enemy unit 3 squares and power increases if enemy unit cannot be knocked back, change into Warm Up Combo
Height Range: 3
Tokkou: +80
Condition: No Knockback
Scaling: 1.5*PATK
Multiplier: 250%
Jewel Cost: 32
Use: 3/3

(Optional)

8 Exploding Palm -> Lovely punches: Inflicts 3-Hit Strike damage and inflicts charm to enemy units in the area, reduces CT by half, reduces Strike Resistance
Range: 1
Area: 2x3 lateral
Scaling: 150%
Combo: 3
CT: -50
Strike Res: -30
Jewel Cost: 15
Use: 3/3

Added moves(Optional):

9. Pretty Spirit: Permanently increase Strike ATK Power by x1.5, Reduces All Water DEF, Buffs and debuffs cannot be removed
Strike ATK Power: +50
Water DEF: -10
Jewel Cost: 15
Use: 1/1
(Suzuka Charge, why not?)
or
9. Pretty Spirit: Increase Strike ATK Power by x1.5 and Raises AGI and Enhances Lovely Kick, Lovely Battle Trance/Flawless Cuteness, and Divine Cuteness Trance for 3 turns
Strike ATK Power: +50
AGI: +20%
Mentioned Moves buffs: Multiplier +50%
Jewel Cost: 15
Use: 1/1
(Original Idea, to counter her AGI weakness)

(Very very optional)

Close Counter -> Counter Shockwave: Pre-emptively inflict Strike ATK to single enemy unit, reduces their Strike Res(Stackable, x3) and raises own Strike ATK Power(Stackable, x3), also procs against skill
ATK: 100%
Scaling: 1.5*PATK
Strike Res: -15
Strike ATK Power: +15

Iron Fist -> Swift Kick: After moving, Water Strike Damage to single target unit, reduces CT by 20, chance of inflicting critical, inflicts stun for 2 turns.
Range: 5
Height Range: 5
Jewel Cost: 10
Use: 3/3

Probable Alchemic effect: Alchemy Freeze on Lovely Charm, Lovely Kick, Swift Kick, and maybe Pretty Spirit gives permanent +100 Alchemy Freeze(That would be OP tho)

Equipment:
1. Battle ready Belt(HP +40, PDEF +10, MDEF+10, DEX +10, AGI+5, Fire Res +10, Water Res +10, Wind Res +10, +10 Thunder res)
2. Cute Skirt(HP +20, DEX +10, AGI +5, MDEF+5, Initial Jewels +10, Light Res +10)
3. Lovely Shirt(HP +50, PATK +30, PDEF +30, MDEF +15, DEX +35, Dark Res +10)
4. Agile Shoes(PATK +50, PDEF +20, Strike Attack Power +5, AGI +10, Max Jewels+15)
5. Charming Gloves(not her gear and it's the cloth gloves of hers) (PATK +45, PDEF +25, DEX +25, Strike Attack Power +5, Jewels get +15)
6. Pretty Hairband(HP +55 , PATK +10, DEX +15, AGI +3, Bind res +10, Daze res +10, Silence res +10, Stop res +10)

Job Master Reward:
HP: +30%
PATK: +7%
AGI: +7%
DEX: +3%
HP: +150

Shayna 5* Memento

Nensou: "Cuteness Is Justice!"
Unlocks: her new skin based on her 4* Nensou
Stats: +30 PATK
VCR: Lovely Gloves
NLS: +20% Max HP, +30% PATK/MATK, +30% Strike ATK Power, +30% Strong vs Wrath/Strong vs Gluttony, +10% AGI to Shayna Fan Club Memento Group

Passive Ability(When full level(30)/full level + limit(40 + 5*):

-Envylia's Momentum: Raises AGI(3/8)/Jewel Obtained(4/10) to Envylan Units

-Roaring Success Group(Different version): Raises Single Target Attack Power(8/13) and Area Target Power(8/13) of the chosen units(Shayna, Alfred, Suzuka, Laura, Leoniaz, Lil Ouroboros)

-Cuteness is Justice: Increase Evasion Rate(10/20), Reduce PATK Debuff Res(40/64), Reduce MATK Debuff Res(40/64) to Chosen Units(Shayna, Laura, Lil Ouroboros)

-To be Cute: Increases Strike ATK Power(10/15), Critical Damage Rate(10/20), Area ATK Res(8/13) and "skill use +1(Max Limit Break)" to chosen units (Shayna, Lil Ouroboros)

-Full Alchemic Boundary Bonus: Increase AGI(+10%) when appeared in map

Vision Ability: Twin Fatal Beauty
Inflicts Strike ATK to enemy units in the area, chance of critical, Increases Power when enemy has their Strike Res reduced, Increase Strike ATK Power for units from Envylia or Shayna Fan Club.
Area: 5x5 diamond
Range: 4
Height Range: 3
Strike ATK Power: +30
Limit: Envylia/Shayna Fan Club
Tokkou: +80
Condition: Strike res debuff
Scaling: 200%
Jewel Cost: 50
Use: 1/1

VCR Gear

Gear: Lovely Gloves
Rarity: Gold/5*
Type: Fist
(Level 1~30)
+21~50 PATK
+6~15 AGI
+1~30 DEX
+1~10 Strike ATK Power
+1~10 Strong vs Human

Ability: Sparkling Cuteness
Inflicts Extremely Powerful Water Strike DMG(Heavy) to enemy units in the area, chance of critical, ignores DEF. Strong vs Fire, Powerfully Strong vs Human.
Range: 7
Area: 5x5 Diamond
Height Range: 5
Jewel Cost: 75
Ignore DEF Rate: -100%
Multiplier: 350%
Scaling: 1.5*PATK
Strong vs Fire: +60
Strong vs Human: +120
Use: 1/1
(PotK reference)

Passive Ability: Increases "Star's Duty" and "Lovely Forte" when equipped with "Pretty Supporter"

Post change:
-Star's Duty:
Increases own Max HP (recovers amount raised)/PATK/DEX/AGI/Strike ATK Power after appearing on map
Max HP: 250
PATK: +50
DEX: +30
AGI: +10
Strike ATK Power: +10

-Lovely Forte:
Raises All Stats at start of own turn (Stackable up to 5x)
All stats(except AGI): +20%(+4%/Turn)
AGI: +10%(+2%/Turn)