Now this is extremely interesting. I need to seriously widen my portfolio of games. Well time to go look at some dragon quest lore. Hers especially. Seriously thanks for posting this.
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It's not the only game - well, manga/game - to use healing bullets. To use relatively recent examples, The Secret World has a healing spec for Assault Rifle users. This game is kind of interesting because you have two simultaneous targets - one slot can only be enemies, the other can only be allies, and the healing (mostly leech healing for this spec) goes on the allied target.
Then, for more direct delivery - Overwatch has both a rifle and grenade launcher that shoot projectiles with healing payloads. It's not the first game to do this by far, of course, but it's popular and well known and so makes for a good example. And there's simple potion tossing as the more traditional-fantasy option.
Of course, a recent trend in online gaming is to drop the trinity entirely in favor of making everyone a DPS (with maybe a little tankiness or a side healing ability here and there, but never as a focus) - or even if they do have the trinity, the simplified, streamlined designs don't allow for much innovation - which is unfortunate because it means these concepts are likely to fall even further into obscurity as time marches on.
For bullets charged with spells, well, we have gunbreaker now, which uses aetherically charged shells. It wouldn't be much of a leap at all to connect this to a new healing class - instead of damage, said aetheric charging could be aligned to healing...