She goes by the name "Lazerous" but her real name is something you'll have to learn yourselves. Lazerous is an eccentric additions to the team, but a powerful one.
Lazerous' class is Witch and her skill type is Magic.
Among all party members, Lazerous is pretty unique. All of her skills deal Non-Elemental Damage. She will never hit the weakness of an enemy--but on the other hand, she will never have her damage resisted or nullified. Lazerous is a way to guarantee damage. If that isn't enough, her skills have weird or interesting properties to them as well. Her Pierce skill will ignore Resolve. Whirl Winder hits all targets and inflicts Sticky.
Lazerous is also deceptively strong in the physical department as well. With high Impact, her standard attacks will deal decent damage. It isn't something she should rely on, but it is an option for her in battle, unlike Rover.
Her Level 1 Decisive Skill is Invisiwall, which adds the Block status to the entire party. This reduces damage for the turn and offers small regen as well. This is helpful to counter Lazerous' biggest flaw. She is extremely frail. Lazerous has one of the lowest HP stats of everyone, and her defensive stats aren't much better either. It is not uncommon for enemy attacks to simply OHKO Lazerous where other party members would easily survive. Keep her protected, and she is an amazing asset in battle.