Thanks for the ideas so far!
FFIX has the following white magic spells:
Cure Restores 300+ HP, single/multiple target
Cura Restores 1500+ HP, single/multiple target
Curaga Restores 4000+ HP, single/multiple target
Regen Gradually restores HP
Life Recovers character from KO, restores some HP
Full-Life Recover from KO with full HP
Panacea Cures Venom and Poison status
Stona Cures Petrify and Gradual Petrify
Esuna Removes various abnormal status effects
Shell Reduces damage from magic attacks
Protect Reduces damage from physical attacks
Haste Speeds up ATB Gauge
Silence Prevents single/multiple targets from casting magic
Mini Shrinks, lowers defense and attack power
Reflect Reflects magic attacks back onto caster
Float Causes levitation, prevents Earth damage
Dispel Removes abnormal status caused by magic attacks
Might Raises physical attack power
Jewel Extracts Ore from a target
Holy Causes Holy damage
Scan Determines HP, MP, and weaknesses of enemy
Confuse Makes single/multiple targets erratic
Berserk Raises attack strength, attacks uncontrollably
Blind Causes Darkness, lowering physical attack accuracy
Some of these will be easy, eg. Berserk will obviously add the CRAZED tag and raise strength. The healing ones will be more troublesome and that is the problem, although the recuperation is a great idea. Protect/Shell will probably do some material damage modifiers. Reflect I have no fucking idea.
These also have to be optimized for Adventure mode - summoners are not playable in Fort mode, nor do genomes have access to magic or summons - in fact only summoners have access to white magic and summons. Genomes will have to rely on items to do the same things, such as a Potion for Cure and a Soft for Stona. Black mages will get the black magic spells, Burmecians/Cleyrans might eventually get some dragoon-related things, and Qus will eventually get "blue magic" spells. It's a goal to have both modes be fun to play and different experiences.
I'm going with the "transform other creature into summon" for now, since transforming themselves...wasn't optimal, as CPU summoners wouldn't use it and it made you naked.
Also, there is a RESURRECTION effect. Phoenix summon and Life spells will have to use that.