Romaji: Ea Pun) are enemies located in the Airway in Mario & Luigi: Bowser's Inside Story. They are annoying blue orbs with yellow spikes around them that highly resemble viruses. They resemble their weak, magenta cousins called Napses, but are more powerful and have 150 HP, eighty more than their weaker relatives. They have the same attacks as Napses have. When one Airnapse gets killed by Mario or Luigi, another one may revive it. The only difference between this attack is that Airnapses do it more often while it is slightly scarce to see Napses doing it. They are often accompanied in battle by other Airnapses or Air Cannons, Air Cheeps and Stonks. They are the only enemies in the Airway not to have a Dark Star icon on them.
They attack the Bros. by making blue balls. Two balls spin around them, and the balls will soon turn either reddish-orange or minty green. Green balls aim for Luigi while red balls aim for Mario.
Their last attack doesn't harm the Bros, unlike most attacks. They use their white magic to cure dead Airnapses.