Let's learn about Marcus Hiro, the no-nonsense, all business guy from Lesaria.
Marcus' class is Weapon Specialist and his skill type is Battle Items.
Marcus is a very unique character. Let's talk about his weapons first. Marcus uses Tools for weapons. Tools come in a large variety with different uses and attributes to them. His Shuriken Pouch tool is very weak, but hits 5 times per attack. His Hammer tool prevents Shields from being equipped, but offers a huge boost to Impact. His Whip tool costs more Energy per attack, but grants a large Critical rate.
Use whichever tool is best for the situation, or whatever you like best. You can always switch weapons during battle as well, to change up your strategy on the fly. Marcus is very versatile in that regard.
Unlike everyone else, Marcus does not use SP for his skills. His Battles Items are unique in that in order to use them, you must craft them before battle. By using EXP Spheres dropped by enemies, Marcus can craft battle items for use in battle. He has two different types: Tonics and Bombs.
Tonics are single target skills meant for utility. Drop stats, inflict statuses, etc. Bombs hit the entire party and are more for dealing damage. Each Battle Item costs the same to craft, so how many of each you craft is up to you and your playstyle.
Marcus' Level 1 Decisive Skill is Poison Fumes which can inflict the entire enemy party with Poison. Simple, but very helpful. Marcus has a lot going for him, but he isn't perfect. His damage output isn't that great compared to others, and to reach his full potential requires learning to craft all of his Battle Items. Invest more in Marcus, and you'll get a lot in return!