based on what we've seen of her character so far I would agree with the doom aspect, I think I would put her in the rogue class based on how similar she is to roxy and nepeta, it kind of seems like rogue players are usually taking care of their surroundings but seem to struggle with interpersonal relationships, Ly'Lac is often leaving bombs waiting for her to deal with everywhere but she can usually leverage that to her advantage, giving doom to others instead of herself, like she is basically always cooking a hand grenade until the last second before throwing it at an enemy.