These two I have are perfect for this, but to keep things fair, I'll exclude their "god" counterparts.
---
Name: Yukiteru Amano
Appearance:
[IMG=http://ts3.mm.bing.net/th?id=HN.608027447747216618&w=139&h=216&c=7&rs=1&p=0&pid=1.7]
World: Mirai Nikki/Future Diary
Power/Weapons: Yuki has the Random Diary, which predicts the future around him (almost anything), but nothing that happens to him. He also holds 12 throwing darts as his basic weapon.
Other: He has a romantic relationship towards Yuno, despite how "extreme" she is.

Name: Yuno Gasai
Appearance: 
[IMG=http://ts4.mm.bing.net/th?id=HN.608050155234526447&w=216&h=216&c=7&rs=1&p=0&pid=1.7]
World: Mirai Nikki/Future Diary
Power/Weapons: Yuno has the Yukiteru Diary, which tells her in ten minute intervals all of the future happenings towards Yuki. She has an axe, a knife, and a pistol as her weapons.
Other: Yuno is a yandere in love with Yuki, and would do anything to make sure she and Yuki survive.