#it's essentially the primary tank. with demonic power being a backup that can be converted to fill that tank when it empties

[mariyekos]

I like to imagine Dante's able to use some basic magic beyond just typical demonic stuff. In the opening of DMC1, a magic circle appears below Trish when Dante shoots the motorcycle back at her, so I like to think Dante knows some basic spells, wards, and the like. For the most part he uses it for little things like making a special lock for his Devil Arm vault, maybe heating up soup or a drink that's gone cold, and so on, rather than any combat things. Dante's spells are not at all refined and he doesn't have a natural talent for it, per se, but he has a lot of power he can put into things so he often ends up brute forcing whatever it is. It's not necessarily efficient, but it works, and that's all he cares about. He's not really interested in most precise or specific things.

Vergil on the other hand has a lot more control and a much greater interest in magic in general. A post DMC5 Vergil (and pre DMC3) would use magic a lot more often, and without as much prep. He spent a lot of time learning different charms etc. to use in daily life, and he's a lot more elegant about it. Some he learned when on the run and trying to hide from demons, while others he learned when trying to track down Sparda, and others still he learned for purely convenience reasons. Post DMC5 he gets a lot more into it than he did pre DMC3 when it was more a thing of survival, even if it had the convenience aspect back then too. He's the kind of person who would learn spells for the sake of knowing them, and while he prefers using demonic abilities in combat, he might try to learn a magical combat spell or two just to see what it's like. He mostly sticks to practical things though (which sit on the border of practicality, but he considers them practical, uses them often, and makes Dante's magic look like child's play).

On the magical third (regrown!) hand, Nero's absolutely horrible at magic, to the point of not being able to do basically anything. He's got the magical reserves, but unlike Vergil who can cast precise spells with relatively little effort, or Dante who gets through spells by basically overloading them until they work, Nero just can't get magic to work for him at all. Lessons with Vergil end with him stomping out when he gets fed up with Vergil commenting on how easy it should be, while attempts to get Dante to explain how he casts magic end in frustration when Dante's explanations basically start and end at "I dunno, it, it just works." Sure Nero can memorize and draw a warding sigil perfectly, but any and all attempts to get it to actually do anything end in failure.

Kyrie, in a reveal that surprises everyone, most of all herself, is apparently extremely talented at magic, which she does not know until she sees Nero trying and failing to activate a warding sigil Vergil taught him, puts a finger on it so she can trace over it as she reviews Nero's work in case he messed something up, and inadvertently activates it. After that they end up doing some testing and discover Kyrie is a natural when it comes to magic. The only problem is that while casting spells, activating sigils, and the like come easily to her, her magical reserves are rather small, limiting what she's able to do. When she first activates the sigil Nero had drawn, she ends up unable to get up and Nero has to carry her to bed (which she insists he doesn't have to do, because she just needs a minute to catch her breath, but he insists on)

Nico is stoked to hear about this and ends up figuring out a way to essentially fit Kyrie and Nero with a magic converter that allows Kyrie to draw on the magical reserves Nero can't utilize so that she can use them for whatever she wants to. While Kyrie isn't someone who really cares to use magic for things in her daily life like Dante and Vergil, she does use it to make little charms for the kids, and to establish wards around the house to protect them from demon attacks and other small misfortunes. She and Vergil end up bonding a little bit as he teaches her the spells and other bits of magic Nero was never able to pick up on.

(Vergil himself feels a mixture of pride at how quickly she picks up on things with his instruction, and jealousy when he sees how good she is at things first or second try when he knows it took him a good five or ten attempts to get it down when he was first learning. Kyrie notices and tells him that he's still much better than her in the long run since he's able to use magic without needing a separate "battery" to power him, but Nero absolutely digs into Vergil about it when Kyrie isn't there. Dante meanwhile finds it all hilarious. But he and Nero are pretty proud of Kyrie too.)