Sarah in Suikoden III.
In Suikoden III, most attack spells have areas of effect and can inflict friendly fire. The problem is that there is no way to reliably control or predict where your party members will be when the spell goes off, so casting an attack spell is a good way to wipe your own party.
The AI cheats and knows exactly when to cast attack spells.
Sarah is a mage with devastating attack spells and an absurdly high evasion stat. She fights alongside five powerful monsters. The trick to beating her is to use a spell called Silent Lake to prevent everyone in the fight from casting spells. The problems are that (1) Silent Lake takes forever to cast, (2) Sarah or her monsters will most likely kill your caster before he can cast Silent Lake, (3) Sarahās evade stat is so high that you might not even defeat her before Silent Lake wears off, and (4) her monsters donāt use magic and so are just as devastating with Silent Lake in effect.
Suikoden III is probably the hardest game in the series, largely because its combat system wasnāt well fought out, and Sarah is the epitome of that wonkiness.