[@Dead Cruiser]The "magic" in this case is more about the source of supernatural abilities. Do they come from spiritual or religious sources(Divine) or learned or inherited sources(Arcane). A Divine Frontliner could be anything from a War Cleric, to a Paladin, to a Druid, to a Blackguard, and even some types of Monks. An Arcane Skirmisher could be a Bard, a Spelltheif, an Arcane Archer, etc. A Divine Skirmisher could be something like a Ranger or Druid that are more focused on wilderness exploration and utility than using animals, natural magic, and weapons to defeat their foes, or a Monk that favors agility and maneuvering over hard, disabling direct attacks. An Arcane Frontliner would be something like a Battlemage, mixing sword and magic to cleave a path through the enemy, or an Arcane Knight, mixing a Warrior Code of Battle with disciplined schooled magic use.

Arcane/Divine mixed could produce something like the priest of a god of magic, who studies spells not common to those of faith in order to widen the knowledge of their church, or a spellseeking Wizard who lusts after every form of magic imaginable.

Likewise, A Frontliner with the Skirmisher mixed in could be a former military Archer who fights in the open but repositions for better line of sight, a Swashbuckler who favors daring heroics over sneaking and skulking, or the Barbarian with a keen eye for avoiding ambushes. A Skirmisher-Frontliner could be a Rogue who prefers to sneak when they can, but isn't afraid to go "loud and proud" when caught, an Assassin who will gladly sneak past every guard in a castle, only to slaughter the lord with an axe in their bedroom, or a Scout who prefers to move ahead and lure foes back to the larger group, all the while picking away at them to soften them for the final blow.

And the Frontline and Skirmisher types can refer to how a pure Arcane or Divine Caster *uses* their spells as well. An Evocation Wizard would be an Arcane Frontliner, while an Enchantment or Illusion Wizard an Arcane Skirmisher. A Fire Cleric might be a Divine Frontliner, while the Cleric of a god of Luck or Trickery might be a Divine Skirmisher.

My idea is for people to expand on what their "class" is through their main techniques, their personality and backstory, and how they play things out in the IC events, rather than lock people down into distinct roles or tell them "No, that character doesn't work with D&D lore."