What do boggarts turn into if you're not afraid of anything? I'm mildly put off by my brother but irritation is hardly fear. Can they become intangible things? Does a boggart disappear is one fears being alone, per se? Or do they becoming tiny to simulate a fear of heights through forced perception? Can a boggart become boredom? What if its choosing of the personification of the abstract isn't relative to the nuances within the overarching concept?

Also, I’d like permission to sit in on all boggart encounters. It is relevant to my extracurricular interests.