ED-E

ED-E (eyebot duraframe subject E) is a Duraframe eyebot and possible companion in Fallout: New Vegas.

Background
ED-E is an Enclave eyebot from the East Coast. It was built by Whitley at Adams Air Force Base. As a prototype "duraframe" model, ED-E has been enhanced for regular combat as opposed to the original model, which functions primarily as a mobile radio transmitter. However, since the war with the Capital Wasteland Brotherhood of Steel necessitated increased production of Hellfire armor, eyebot production was stopped, and ED-E became the last surviving model. Whitley uploaded an enormous amount of valuable data on Poseidon Energy and his duraframe research into ED-E's logs, then dispatched it on a cross-country journey to Navarro, past Rockville, Hagerstown, The Pitt, Dog Town, Nephi, Zion Valley, Caliente, the Hub, Necropolis, Lost Hills, and San Francisco.

ED-E's first stop was a hidden Enclave outpost in Chicago for upgrades and repairs. It then traveled across the Mojave Wasteland where it was shot twice by an unidentified sniper, dealing a large amount of damage. This eventually left it deactivated near Primm, where it was found and taken in by a courier of the Mojave Express and given to Johnson Nash, the building's resident. Unable to repair it himself, Nash left ED-E to languish on Primm's branch office counter, where it remained while Primm was taken over by escaped convicts. When the Courier arrives in Primm, he/she is able to repair ED-E, allowing the eyebot to join the Courier's quest as a companion.

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

Quests
It is possible that there will be a quest in Fallout: New Vegas add on Lonesome Road because of the achievement.
 * ED-E My Love: Once ED-E's logs are discovered, the Brotherhood of Steel and the Followers of the Apocalypse both express interest in it, offering upgrades in exchange for its data.

Other interactions
When first found in the Nash Residence of Primm, ED-E is broken and lying on a counter. To fix it requires one of the following:
 * Repair skill of 65
 * Repair skill of 35 and a Science skill of 55
 * 3 pieces of scrap metal, 2 sensor modules and 1 scrap electronics

Appearances
ED-E appears in Fallout: New Vegas, and on the cover of All Roads. ED-E is also mentioned in Lonesome Road.

Bugs

 * If you travel to Big MT without completing ED-E My Love, the Followers option may never appear.
 * Exiting Bloodborne Cave may glitch ED-E to be stuck in the opening of the cave. Even with the latest patch, ED-E will instead show up as a marker, but can't be found in the surroundings or in the cave. This can also happen around the entrance of Vault 22.
 * When at Black Mountain, it is possible that ED-E will disappear after the Courier is attacked by super mutants in the small pass with the bear traps and the large boulder. It can also happen in the entrance of Vault 22. This might be fixed by going to Sierra Madre (and starting the Dead Money add-on) or by using one of the companion dismissal terminals loaded by the patch released just before the release of Old World Blues. There will be a message saying that ED-E has returned to Primm.
 * After upgrading ED-E's armor, its inventory weight goes up from 1 to 2. Traveling to the Fort and back with ED-E as a companion permanently adds an additional 2 to its weight EACH time you go there, eventually making it impossible to place items in its inventory anymore. There is no known way to remove this invisible item weight, and the only way to prevent it is by firing ED-E before traveling there. Telling him to wait elsewhere before going to the Fort still adds the extra phantom weight. Apparently, its laser is being duplicated each time your weapons are forcibly removed at the Fort. Even if you enter the Fort without invitation, or the proper Legion reputation (i.e. bad rep, not giving weapons), this may happen. This does not happen at the casinos, though.
 * After upgrading ED-E with the Followers, if it is destroyed, the dialogue and 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 if it strays too far from the Courier by its own way being in [DANGER] mode because of the hostiles around it. A related bug exists where if ED-E is destroyed, its perk still remains in the Courier's Pip-Boy and still fully working.
 * ED-E delivers a message from the Brotherhood after enough trigger words are activated. During the last paragraph of this speech, the speaker's dialect changes to that of a Hispanic male (possibly from one of the developers of New Vegas), and the player is stuck without being able to bring up the Pip-Boy or move. The following speech made by the Followers of the Apocalypse will not play. Quitting to dashboard and reloading does not fix this bug. However, entering via console seems to fix the problem on PC. You may also try telling ED-E to wait in a place prior to receiving the message and retrieving him later.
 * The Upgraded Zapper from the Followers of the Apocalypse upgrade can be lost at random, particularly in casinos or in Caesar's Fort. It is actually two different weapons: Energy Zap(00166B94) and Electrical Zap(001694DF), and can be restored with after targeting ED-E. They require energy cell ammunition (00078CC2), but don't actually consume it.
 * It is possible for ED-E (after the armor upgrade) to not use its weapons and not even move. If you fast-travel or use the wait command, it will rejoin you.
 * Sometimes while speaking to ED-E, a gunfire sound will trigger instead of the regular beeping noise.
 * When opening ED-E's inventory, you may not be able to see the option of putting any weapons or apparel in (and possibly other items). Simply exiting the inventory screen and re-opening will allow you to put weapons and apparel in (only happened first time opening ED-E's inventory after acquiring as a companion).