I'm stuck on dragons for a bit, forgive me 😂
Anyway, I've hid this idea in mind and figured I'd test it.

Breath weapons are some of the most common seen abilities of dragons, and Mica and Boris are no exception.

Boris is able to use a poison/venom. It's a dark purple color as usually seen. :'D His usual method is injection much like a snake, but he is also able to create poisonous clouds and spit venom similar to a cobra. His poison/venom isn't acidic per say, but it can be corrosive if left for a long period of time. It doesn't cause much of a problem for himself, but he is VERY careful if he's hunting for both himself or Mica.

If she grew up properly, Mica would be able to use fire. Unfortunately she isn't able to make full use of the ability until she's MUCH older, but for now she's able to breathe a very thick smoke and create sparks that are capable of actual explosions if placed properly, as well as make her own teeth super heated. The heated teeth DO somewhat burn her, but her bites are much more painful and instantly cauterized. So she may not be able to fully breathe fire, but she's still incredibly dangerous in a sense of causing damage and effectively choking something.