Here's the roster of FF characters(they all counts as Kingdom Hearts characters) that's shows up in Ani-toonspiracy(sorted by FF they comes from):

FF1:

• Warriors of Light(summon character)

FF2:

• Firion
• Maria
• Minhu

FF3:

• Moogles(this was nothing new in KIngdom Hearts)

FF4:

• Rydia

FF5:

• Barts Kaluser
• Faris Schwertz

FF6:

• Locke Cole
• Setzer Gabbiani
• Terra Branford
• Sabin Rene Figaro
• Edgar Roni Figaro(he's Cid Highwind's cellmate)

FF7:

• Cloud Strife
• Tifa Lockhart
• Barrett Wallace
• Aerith Gainsborough
• Red XIII
• Yuffie Kisaragi
• Vincent Valentine
• Cait Sith
• Cid Highwind
• Zack Fair

FF8:

• Squall Leonheart
• Rinoa Hearthily
• Selphie TImmitt
• Seifer Almassy
• Fuu
• Rai

FF9:

• Vivi Ornitier
• Zidane Tribal
• Princess Garnet
• Steiner

FF10:

• Tidus
• Wakka
• Yuna
• Rikku
• Paine

FF1-5 characters here will be mostly their reincarnations or/and descendants