Following on my previous post, the summons!

eest: repo-man spanner attack. Physical damage.
Miriel: Esuna and Regen on all allies. Miriel will not arrive if summoned when there are flying enemies.
Raistlin: Damage to all enemies, but also damages other members in party.
MILF: Transforms Pike into a robot for three turns, increasing physical damage dramatically but removing her ability to cast (ie, buff/debuff) or summon.
Shlup: Bitches out an enemy, causing it to get Stop status for a few turns.
Peegee: Confuses all enemies, and probably confuses the player, too, somehow.
Kalen: Extremely heavy damage to one enemy.
theundeadhero: Grants foa undead status (ie cannot be killed unless healed) for three turns, then reverts her to previous health and status.
Roogle: Dismisses weaker enemies with a formal statement.
Samuraid: Guaranteed steal from all enemies.
Baloki: Increases productivity (Haste on all allies).
Mirage: Makes all allies invisible and thus impervious to attack for three turns.
Melissaur: Stomps on all the enemies dealing physical damage (like any good dinosaur would).
Rantz: Bacon lands on field, healing all male allies significantly.
MB: Strawberries land on field, healing all female allies significantly.
Quin: Changes the HP/MP of an opponent with his own.
Iceglow: Puts all enemies to sleep.
Manus: Swansea play Liverpool in a cup match. If Liverpool win, Psy regains all health and Manus punches a single enemy. If it's a Swansea win, the enemy (and Psy) are silenced and Psy gets protect(ive).
G13: Guards Jiro for three physical attacks.
Freya: Steps in for Jiro. Casts three random black magic spells over the next three turns, with Jiro gaining rather than losing the MP that would have been used for those spells.
NCG: Flash attack. Blinds all the poor, unsuspecting enemies.
smitten: Heal/Protect on all allies.
DK: Damages all enemies. Damage increases should Psy be in your party.
Levian: Lev walks by and all the enemies are charmed.
Vivi22: Increases experience gained by party members for this battle.
Jessweeee♪: Adds healing to all buff spells.
Shiny: Adds haste to all buff spells.

And the random summons (naturally they don't appear in boss fights)...
HC: Hits an enemy for 1,000 health. Obviously.
blackmage_nuke: Only appears after one of your allies has been KO'd. nuke picks up the KO'd character's weapon and hits the toughest enemy with it, killing the enemy.
edc & Sephex: They unleash the fury with some heavy metal, and all characters get their limit break next turn.

Oh man, now I need to think up limit breaks.