ED-E

Eyebot (Duraframe) – Subject E, or ED-E for short, is a 6 year old shop security robot at Primm. Its armor and weapons are more advanced than standard eyebots.

Background
ED-E is an Enclave eyebot from the East Coast, built by Whitley at Adams Air Force Base. A prototype "duraframe" model, it contains an enormous amount of valuable data and was sent on an incredible journey, first going to Navarro for upgrades, then continuing its mission but being shot twice by an unidentified sniper before finally deactivating near Primm. It was found and taken in by a courier of the local Mojave Express branch and given to Johnson Nash, but it was never repaired before the Powder Gangers arrived in town. When the Courier arrives in Primm, ED-E remains unfixed, but if repaired, ED-E will join the Courier on his or her quest.

Though ED-E still retains all of its data and an understanding of its mission, its internal positioning hardware is badly damaged. The only reason it has not been seized by interested parties is because ED-E has not communicated its special mission to anyone.

Interactions with the player
To fix it requires one of:
 * 65 repair skill
 * 35 repair with 55 science
 * 3 scrap metals, 2 sensor modules and 1 scrap electronics

ED-E can later be upgraded by either the Brotherhood of Steel or The Followers of the Apocalypse.
 * The BoS upgrade gives +12 DT, for a total of 20
 * The FotA upgrades ED-E's primary long range weapon to a blue energy projectile weapon with a high critical chance.

Endings

 * If ED-E remains forgotten in the shop of Johnson Nash, it is eventually repaired by another courier who lets it continue on its journey to Navarro. ED-E is eventually discovered by the Followers of the Apocalypse who manage to recover vast databanks of scientific knowledge.
 * If its logs are never cleared, ED-E travels with the Courier until one of its memory banks is triggered, causing it to continue its travels on to Navarro. Upon reaching Navarro, ED-E vanishes and is not seen in the wastes again.
 * If its logs are cleared and its systems are upgraded by the Followers, ED-E remains a vigilant and constant companion to the Courier. The Followers of the Apocalypse use the information recovered from ED-E on Poseidon Energy to develop new methods to harness the energy of the sun.
 * If its logs are cleared and its systems are upgraded by the Brotherhood of Steel, ED-E remains a vigilant and constant companion to the Courier. The Brotherhood uses the information recovered from ED-E to create a small army of Duraframe Eyebots.
 * If the Courier never returns to Primm to recover the upgraded ED-E, the robot is discovered by a travelling caravan, who take it on as a protector as they wander the wastes.

Appearances
ED-E appears in Fallout: New Vegas.

Unexplained attacking or hostility against NPCs
Occasionally and at random intervals, ED-E, Rex, and Lily may enter into seemingly unprovoked fights with non-hostile NPCs. Obsidian designer J.E. Sawyer has explained the cause of the bug.

Despite the apparent hostility caused by these situations, occurrences of this bug will not cause any lingering hostility between the Courier and any specific faction or group of NPCs.

The release of Fallout: New Vegas patch 1.2.0.31x is reported by Bethesda to address this problem.

Other bugs

 * After upgrading ED-E with the Followers, if it is destroyed, the dialog & text about losing its perk after its death will not appear at all. You can lose ED-E without noticing its death in battles or Vaults if it strays too far from the Courier by its own way being in [DANGER] mode because of the hostiles around him. A related bug exists where if ED-E is destroyed, its perk still remains in the Courier's Pip-Boy and still fully working.
 * Despite the apparent hostility caused by these situations, occurrences of this bug will not cause any lingering hostility between the Courier and any specific faction or group of NPCs.
 * ED-E may sometimes become inaccessible, or disappear, most notably in the quest where you interrogate the prisoner at Camp McCarran and ED-E gets locked in the interrogation room. This and any other disappearance, can usually be rectified by traveling to Vault 22 and using the elevator to travel to any floor, but the quest involving Keeley will need to be completed first.
 * ED-E delivers a message from the BoS after enough trigger words are activated. During the last paragraph of this speech, the speaker's dialect changes to that of a Hispanic male, and the player is stuck without being able to bring up the Pip-Boy or move. Quitting to dashboard and reloading does not fix this bug, however entering via console seems to fix the problem on PC.
 * If ED-E is rendered unconscious via an explosion it has a tendency to disappear, but will remain stuck as a companion. If ED-E disappears but is still a companion (check if you still have the Enhanced Sensors Perk) e.g. After triggering the Vault 22 explosion/fire, Use the console with the command, then you need to type, followed by , then .  It may also be necessary to use  as well in order to retrieve him as he may have been marked as dead despite being essential.
 * ED-E's weapon may sometimes appear to be floating in midair underneath it. To fix this, fire ED-E and follow it until it goes through a door to a new area. Go through a couple of seconds after it and it should look normal again. Then you can re-hire it. Quickest way to do this is to just enter a house and fire it there right in front of the door. Experienced with armor-upgraded ED-E.
 * Like other companions, ED-E will drop faction armor like the Brotherhood T-51b power armor and others that can be obtained even early in the game. Exercise caution when loading ED-E's storage, as you might not notice the dropped armor and error message.
 * During the quest Ant Misbehavin', ED-E may become zoned out or stuck in one of the walls of the Nellis Generator room if you activate the sonic device given to you by Loyal and may stay there. If this happens you will not be able to see or speak to ED-E but others can still see it and comment about ED-E's presence and you still receive ED-E's perk. To fix this just reload a save before activating Loyal's sonic device and it should revert things back to normal. Even when not doing this quest, ED-E may "disappear" at Nellis Air Force Base.  The player will still have the Enhanced Sensors perk, but ED-E will not be present.
 * Because of a glitch where companions lose their default weapons upon exiting a casino, ED-E sometimes loses its only weapon and becomes useless in battle. This can also happen upon leaving Cesar's Fort location
 * ED-E can explode if damage is done to him while he is unconscious. You will not be able to get your equipment back.
 * If you tell ED-E to wait, and you go to certain locations, ED-E will randomly show up and rejoin your party (happened while in Vault 34 and on the "All or Nothing" quest).
 * Exiting Bloodbourne Cave may glitch ED-E to be stuck. ED-E will show up in the World Map with the latest patch but can't be found in the surroundings or in the cave.
 * Sometimes the tune that is played by ED-E when in battle will "echo", by replaying the tune for each enemy spotted, up to three times at once. This only occurs when combat is started. [Confirmed on PC].
 * If you store a NCR armor into his inventory, it will instantly disappear from him after a notice let's you know that ED-E cannot wear NCR faction armor.
 * If ED-E waits too long and returns to Primm, he becomes hostile.
 * FoA Upgraded Zapper lost in Casinos or randomly is two different weapons, Energy Zap 00166B94 and Electrical Zap 001694DF, can be restored with after using left-click on Ed-E while in console to target Ed-E. The ammo is not MCA, but Energy Cell 00078CC2 (which seems to not get lost).
 * Telling ED-E to wait or follow you will restore it's health fully. This is beneficial in saving a few extra stimpacks. Fixed in the 14th of December patch.
 * When ED-E returns to Primm after becoming lost, he will be hostile. If you have the Ranger Takedown attack and a Stealth Boy, there may be a chance ED-E will return to you as your follower. Allow ED-E to kill the people inside the store at Primm, then use the Ranger Takedown to temporarily knock down ED-E. Immediately after, use a Stealth Boy and crouch until hidden. Once hidden, stand up and repeatedly attempt to engage ED-E in conversation. If done properly he will start talking and you must then (Initiate companion protocol). This worked for me, after hours of trying to get ED-E to follow me.
 * The Same issue with ED-E going hostile is on the pc. the easiest way to fix it is go to the console and type followed by . then leave the shack and reenter and talk to him to get him to rejoin. then type in  and  again to start the AI back up.
 * Unpatching the game while ED-E is a current companion will cause him to no longer regenerate health. When he dies, it will not give you the message that he has and that you have lost his perk.  When Senior Knight Lorenzo calls you through him during the quest ED-E my love, after the text box goes away you will be frozen and will be unable to move even if you save and reset or exit to the main menu and then reload your save.  Confirmed for Xbox 360.
 * Like all companions, if ED-E has been told to wait before you enter a vault or bunker, he will appear by you after you have entered a door to a new map.