Thinking out loud here for 2 maybe possible ways to achieve this.. and I think this will also depend on your genre of RPG, is it Action or Jrpg.
1. Have you tried attaching the sound you want to play to the animation's flow sheet in the actual animation section in Bakin..? OR...
2. Maybe try to create a common event that calls the sound to play, then attach that to the skill in the skills menu, so once the skill is used it'll call the common event to run also at the same time. If you want different sounds for each character in this same common event you can do a check for which character it is then play the specific sound.

Well, first of all, I'm really grateful for your response. Much obliged.
Second, I'd like to give a little context: it's a JRPG style, like Octopath traveler (in the sense of of 3D environments with 2D sprites.

Now, concerning the issue, the thing is that I squeezed my brain out trying to figure out the conditional that would check when to play the sound (for example, every time character get hit / Every time characters get healed). To be precise, I tried using common events, but I can't figure out how to set up the common event. It seems I can't grasp which option should I use: "Variables? Switches? how do I tell the game to kn now when characters get hit. In fact, if one goes to the battle AI when configuring a cast as enemy, you would notice that, in the actions section, on of the conditions is "when attacked" or something like that, I can't remember very well. It would make my life sooooo easy if an option like would exist, like, logical conditions.

To sum up: With events, I can't decipher how to set the event in such a way that the game would check every time players get attacked.

Now, regarding about configuring the animation, I wouldn't know, actually. Is there a way? maybe is there an option I missed?

引用自 SirLantro：

Well, first of all, I'm really grateful for your response. Much obliged.
Second, I'd like to give a little context: it's a JRPG style, like Octopath traveler (in the sense of of 3D environments with 2D sprites.

Now, concerning the issue, the thing is that I squeezed my brain out trying to figure out the conditional that would check when to play the sound (for example, every time character get hit / Every time characters get healed). To be precise, I tried using common events, but I can't figure out how to set up the common event. It seems I can't grasp which option should I use: "Variables? Switches? how do I tell the game to kn now when characters get hit. In fact, if one goes to the battle AI when configuring a cast as enemy, you would notice that, in the actions section, on of the conditions is "when attacked" or something like that, I can't remember very well. It would make my life sooooo easy if an option like would exist, like, logical conditions.

To sum up: With events, I can't decipher how to set the event in such a way that the game would check every time players get attacked.

Now, regarding about configuring the animation, I wouldn't know, actually. Is there a way? maybe is there an option I missed?

Ah okay, so Octopath 2.5D style, yeah so easiest way would be to do the battle common event check BUT don't attach it to a skill, just have it run in battle constantly checking. Now, im not entirely sure IF you can do the sound played per hit.. but maybe a possible work-around (that's not tested so might work or might not) is in the battle common event do check branches for each of your characters that plays the sound every time their HP is lowered maybe..? I've not touched Bakin in a good few months so dont know what theyve added or not added with the battle and eventing commands.

You might be better off heading to the Bakin Discord and asking this question there, answers will be faster, and probably more helpful than some suggestions/solutions ive been giving you.