Yes, like many games, Oblivions "creatures" will re-spawn after a set amount of time. Several in-game days, hours, etc. This includes many "unnamed" NPCs, such as Bandits.
Enemies will respawn in the game Oblivion but you have to leave the area for a set amount of time
No, not unless u leave the area and then come back into it. In which case .. Yes they do !
Yes, there is only one unicorn in oblivion. Although i am unsure of it's location. If the unicorn dies, it does not respawn.
the tes4 construction set is not included in The Elder Scrolls 4: Oblivion game of the year edition but you can download it from: http://www.elderscrolls.com/downloads/updates_utilities.htm
Only after installing a mod that someone made.
The Ice Blade of the Monarch is in TES 3 Morrowind, not Oblivion. You may be able to find a mod that will add it to the game but I'm not sure.
It lets you carry more than your usual weight capacity.
No. The Adoring Fan is the only NPC that respawns. If you kill an NPC, they are gone for good.
To kill any kind of ghost or spirit in TES 4: Oblivion, you need to either use spells, or enchanted, silver or daedric weapons.
In my own opinion the silver long sword causeit can kill ghosts
You cannot buy it, it never becomes available for sale regardless of your level.
in the elder scrolls v skyrim objects respawn to shop after to days but some shops four and some seven but if you wait outside the shop for seven days the object wont be the until you leave the area and come back
To enter codes on Oblivion, you must have the PC version. While in gameplay, press the tilde key (`) under ESC. That will open the console. Then you enter the code you want.Example: tgm will put you in God Mode.
Go to the office of imperial commerce (I think) make the woman like you then buy it for 2000 septims