1. Call him "big nose" in front of his friends.
2. Set his sword on fire.
3. Lie by telling him that Darth Vader is his real father.
4. Tell him that Luke Skywalker and Princess Leia are his siblings.
5. Send him on a wild goose chase with the promise of knowing who he really is as a final reward.
6. In the end, reward him with cake and grief counseling, instead.
7. Tell him that he's actually a living doll like Kurow, except he was modeled after Nagi, and that he must sacrifice himself in order to defeat Yami. Enjoy as he has a nervous breakdown and goes through the seven stages of grief.
8. Use his sword as whittling wood.
9. Use his sword as firewood.
10. Use his sword as a back scratcher.
11. Tell him that his red highlights make him look stupid. (No offense).
12. Trick him into carrying Nanami for the next six weeks. No chiropractors allowed.
13. Have him give Chibiterasu a piggyback ride.
14. Enter him in a high stakes eating competition against Manpuku. Looser dies.
15. Send him a love letter, claiming to be Kagu, asking him out on a date. Dramatically reveal yourself when he is at the pinnacle of joy in order to better crush his hope. Watch as he throws a fit, the sounds of which will attract the REAL Kagu, who will take pity on the poor sap and comfort him. Kill her on the spot. Congratulations, you've just potentially ruined his love-life. Grab some popcorn and enjoy as he goes through a series of mental/physical/emotional breakdowns, ultimately resulting in him committing seppuku. Good job, you psychopath!
Be sure to review and/or submit your own ideas! Remember to tell which way is your favorite and why. (Or not).