Monster Allergy can be good for learning English if you already understand everyday conversations and want more consistent practice. Learners will hear plenty of useful natural English, but some lines may still require a second listen. The storyline is easy to follow, so missing a few words should not stop learners from understanding what is happening. At an average of around 92 words per minute, the dialogue is generally manageable, though some exchanges require more attention. If your English is close to A2/B1, Monster Allergy can be useful for learning topic-based vocabulary.