I hesitate to answer being that I'm a fire main but here goes.

The reflect only reflects one ailment per turn. If you inflict more than one say with the AOE paralysis skill only one character will be unaffected.

Kurenai has the same reflect skill. It will bounce back even the reflected status. Unfortunately who it lands on is random.

Fire Mains using control skill sets tend to have weak offensive output as a character. Instead that team will most likely have another character that either the fulcrum of a long combo or a damage dealer in the form of Multi Ignition or Poison skills. This character is most likely soft. Find it and kill it asap the skill for targeting low hp targets with multiple basic attacks should greatly help this.

That's enough treachery from me. There should be enough info to be able to make me regret doing this.