I might as well describes the Vita-exclusive character.

In the PSV version of GoS, Akyu has been undummied out. She has above average HP (her HP is higher than Reimu's or Lithos'), low MP, and even worse stats than Satori, strangely her stats growth explodes when she's Lv99. Her unique weapon is Brush, basically a cross of spear and rod, with good support skills. She can equip up to medium armor and shields. Using her Gensokyo Chronicles, she can copy enemy's skills by killing them herself. Her skill is divided into 4 forms. Magician form gives her all sort of mid-top tier spells, Warrior form gives her all sort to top tier physical attack including second tier elemental breath, Insect form gives her lots of debuff skills, and Aquan form gives her really good support skill. In short, she's a good multiform jack-of-all stats. She does have a weakness though: Her lives and bomb are just 1 and 2 respectively. Die once in any battle, you can't use her anymore. Her Last Word is
Gensokyo Chronicle, it reduces all damage against the party to 1/3 for that turn only.
On top of being a good jack-of-all-stats, she's also an AMAZING support. Her Commander skills are:
Passive: Item Drop Rate +100% (Yes, she doubles item drop rate)
Support 1: Treatment: Cure Permanent and Variety status, and restore HP to the whole party
Support 2: Blast: Damages all enemy. Damage: High
Her skill tree consists of Poetry Wing, Record, Memorization, and Chronicle. Poetry Wing increases her HP, MP (up to 50% and 40% respectively), Lives, and Bomb. Record strengthens her physical attack. Memorization strengthens her magical attack. And Chronicle increases her gained experience and party experience value as well. (Note: Her 20 POW skill tree except for Poetry Wing increases her lives by 2). Increasing her Brush skill tree gives her small boost of PATK, MATK, ACC, Physical Deflect, and gives her healing skills and Mystic based attack.
Disclaimer: This information may be wrong though as I can't read Japanese that well.