How to annoy Levi Ackerman:-

5. Let Hanji roam free in his office

This will probably result in Hanji being in there for hours on end, just looking through his crap. He will most likely burst in and be POed beyond all reason. Then he will have to chase her around while you follow with a camera.

4. Write "I love Jaeger" on his forehead while he sleeps

He will go down to breakfast and get all sorts of weird looks from people and have to scream at them for laughing at him. The poor dear probably thinks it's because of his hight. So when Hanji bursts out laughing, Petra leaves the table, Eren falls out of his chair the colour of a fire truck and poor Erwin nearly looses his eyebrows, Levi is forced to look in the mirror, where he gets a pleasant surprise.

3. Constantly tell him that Farlan and Isabel would be proud

No matter what he does, constantly tell him that Farlan and Isabel would be proud of him anyway. He will most likely be A) very flustered or B) very POed about how you know this, both are very satisfying results. If you are asked this, say you read the notebook that was on his desk (his diary) and read about them there. Be certain to film his reaction.

2. Put pictures of Eren in every nook and cranny of his room

In his closet, under his pillow, between pages of his books, anywhere you can, just put Eren everywhere. He will be shocked at first, but as the plan progresses, he will most likely be going insane from over-exposure to Eren Jaeger. Note : be sure to replace the pictures after he finds them so they never run out. Also, if you're a certified savage, put some Ereri doujinshis in there as well. Make sure it's Eren seme.

1. Constantly remind him that he is basicly the basis for all ships along with Eren, and that must mean something

Follow him around pointing out the people who the fandom puts him in a relationship with, as well as the people Eren is shipped with. Then drop hints about "Oh! You two are associated with pretty much every ship in this place. How perculiar~" slipping in the fact that him and Eren should hook up. Beware, he will most likely pop you in the nose.

Hint+for extra laughs

You will need a camera for most of these so you can create a movie and share it with the whole Survey Corpse at Christmas (AKA Levi's birthday). Title it 'Levi's best moments' so he thinks it's just him on the battlefield or something. Also record this and edit onto the video later.