Although Yukiko has significantly low Strength, she is a potent Fire-based attacker, with one of the highest Magic stats in the party and learning the full Agi lineup alongside Fire Boost and Amp. She's also the best healer on the team, learning potent healing skills the earliest among the party, gaining Recarm and Samarecarm, and going all the way to Salvation which Teddie cannot pick up. However, she is very fragile between her very poor Endurance and HP.
Yukiko is strong against Fire, and her weakness is Ice.
If the protagonist maxes out Yukiko's Social Link, her PersonaKonohana Sakuya will transform into Amaterasu, helping her null Fire entirely and resist Electricity. She'll also lose a bit of Magic and Endurance, in exchange for Agility and Luck.
In Persona 4 Golden, Yukiko's moveset is largely unchanged, learning every skill that she would in vanilla P4 at the exact same levels. Her Social Link grants her Mudo and Mudoon to diversify from just Fire attacks, and augment her early healing with Divine Grace and Amrita. Bike Skills include Matarunda to aid survival and Mind Charge to dramatically amplify her DPS.
If Yukiko's Social Link has been maxed out, if the protagonist talks to her during Winter, her Persona will change to Sumeo-Okami. She'll then be able to drain Fire and null Electricity. She'll also be able to learn Burning Petals, being able to inflict Severe Fire damage to all foes.
Combatant that doubles between offense and recovery. Stacking elemental boosts frees up her accessory slot. Samarecarm and Amrita are best replaced by consumable items, freeing up slots for utility in Mudoon/Fire Break.
Combatant that doubles between offense and recovery. Stacking elemental boosts frees up her accessory slot. Mind Charge is mandatory for maximizing Yukiko's damage potential, and Matarunda is a good choice for a support skill.
Combatant that doubles between offense and recovery. Stacking elemental boosts frees up her accessory slot. Mind Charge maximizes damage output, and Fire Break, Mudoon and Matarunda fill out alternative skills.
Combatant that doubles between offense and recovery. Stacking elemental boosts frees up her accessory slot. Mind Charge maximizes damage output, and Fire Break, Mudoon and Matarunda round out remaining skills.