Name: Templar
Role: Tank
Gear set: Fending
Weapon: Tower Shield + 1handed Polearm
Gameplay: Tank job that drops sustain and self healing for heavier mitigation. Features multiple types of damage mitigation abilities that require a higher degree of awareness and timing of use than other tanks which provide very strong mitigation provided they're used against the correct types of attacks, situations, and timed correctly as some will have CD's and active windows similar to the SAM skill Third Eye.
Name: Shaman
Role: Healer
Gear Set: Healer
Weapon: 1 Handed mace/warhammer + Fetish/Totem
Gameplay: Features a few basic GCD cast healing spells +cleanse/esuna. Majority of gameplay revolves around executing various melee combos in order to build gauges and charges for it's OGCD skills. Will likely require a higher level of player skill than current healing jobs due to need to be in melee range as much as possible to build resources while also managing multiple different resources along with the actual CD's
Name: Armamentalist
Role: DPS
Gear Set: Caster
Weapon: Mystic Sword
Gameplay: Those familiar with the Dragon Quest series will recognize this job. It's essentially that franchise's answer to Red Mage. However since RDM in this title is primarily a long range caster that sometimes hits things with it's sword I would have the Armamentalst be the other end of the spectrum being very heavy in magical melee combo's and abilities and light on long range spell casting having all of it's damage output including melee auto attacks deal magical damage scaling off INT.
*Edit* on thinking on Armamentalist further. They could tie it into a permanent crossover like they did with Monster Hunter. With Dragon Quest it would be easier since it's also an SE franchise. The Job's skills could literally be skills from that game using the element names as well. (Krack, Frizz, Sizz, Bang, Woosh, Zam, etc...) Specifically a majority of the magic melee attacks utilizing DQ's name tiering style for the periodic upgrades while also finding a way to utilize some of the endgame abilities like Gigaslash, Gigagash, Gigacross, Big Banga, Lightning Storm, etc.. and utility skills like Heal/Remiheal, and Miracle Slash.