Issei Matsukawa can be annoying that's for sure. His friends say that, his teachers say that, his teammates say that.Though, he's just a great guy who likes to poke fun at people sometimes.

A person more annoying than him is definetly his younger brother. He can confirm how nosy and ignorant his brother can be.

Especially when he barged into his room to play legos when he saw that Issei and his girlfriend(you) were building legos together.

"Get out, you brat. I have a girl over" He glares.