Hmm. I can give the official numbers, but I don't know how much they'll aid comprehension. Still, let's start from there.
Golden Sun has basically two types of party members, which the fans tend to call warriors and mages. Felix is a warrior-type, meaning he has more HP and less MP. (His other stats are also weighted toward physical rather than magical combat, but they're less relevant to this question.) At the beginning of the game, he's level 5, with 79 HP and 27 MP. Cure costs 3 MP, so in the beginning Felix can cast it nine times before running out (though casting other things and restoring MP by walking around or sleeping can adjust that number). The official description says it restores 70 HP, a bit less than his maximum at that point but more than the mage-types who start with him have. In the first game Isaac, who is functionally equivalent to Felix, starts with Cure at level 1, with 41 HP and 18 MP. (To give you a better idea of the advancement, at level 30 Felix has about 300 HP and 90 MP, unmodified. At this point he also has the two upgraded forms of Cure.) Cure specifically does not work on "downed" characters (those who have been reduced to 0 HP) and only affects one character at a time.
Does that help? I can try to dig up more facts and/or go into headcanon if you want.
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Golden Sun has basically two types of party members, which the fans tend to call warriors and mages. Felix is a warrior-type, meaning he has more HP and less MP. (His other stats are also weighted toward physical rather than magical combat, but they're less relevant to this question.) At the beginning of the game, he's level 5, with 79 HP and 27 MP. Cure costs 3 MP, so in the beginning Felix can cast it nine times before running out (though casting other things and restoring MP by walking around or sleeping can adjust that number). The official description says it restores 70 HP, a bit less than his maximum at that point but more than the mage-types who start with him have. In the first game Isaac, who is functionally equivalent to Felix, starts with Cure at level 1, with 41 HP and 18 MP. (To give you a better idea of the advancement, at level 30 Felix has about 300 HP and 90 MP, unmodified. At this point he also has the two upgraded forms of Cure.) Cure specifically does not work on "downed" characters (those who have been reduced to 0 HP) and only affects one character at a time.
Does that help? I can try to dig up more facts and/or go into headcanon if you want.