I think we should also dedicate some emphasis on the Evas, which allow the
HUMANS to fight the
MONSTERS 
Evangelions:
Definition:
To quote Ritsuko, an Eva is a thing created by man in mans' own image. In more detail though, an Eva is a copy of the first Angel found in Antarctica; Adam, however, modifications had to be made to allow NERV to control it. Unlike the Angels, an Eva doesn't possess an S2 engine, therefore energy is supplied via an umbilical cable. Should this cable become severed, an Eva can operate on an internal battery for no more than five minutes due to the current limitations in battery power, after which the Eva should supposedly cease to function

Eva-00
- Pilot: Rei Ayanami
- Eva was upgraded shortly after the eighth Angel is destroyed. Change of colour tone from orange to blue/white also.
- Has been known to run amok a couple of times already, including during the starting.
- It's highly likely that Unit 00's core was in fact built from the soul of Rei Ayanami.

Eva-01
- Pilot: Shinji Ikari
- Ability to move without the use of energy cord, probably due to the fact that Yui Ikari's soul exists within Unit 01's core as a result of her synchronisation accident, this would explain Shinji's frequent visions of his mother when in Unit 01's entry plug.
- Wasn't built from Adam, but from Lilith (fyi: Lilith is capable of instigating the third impact)
- In the end, it was used as a substitute for Lilith.

Eva-02
- Pilot: Asuka Langley Soryu
- First Eva production model to be constructed
- Unit 02's core was also built from the soul of Kyoko Zeppelin Souryu as a result of her synchronisation accident.
- Has performed under extreme combat conditions such as underwater and in molten lava

Eva-03
- Pilot: Toji Suzuhara
- First test activation at Matsushiro goes horribly wrong as the dormant thirteenth Angel within the Eva's body awakens taking control of the Eva, helplessly trapping its doomed pilot
- NERV classifies the Eva as the 13th Angel and attacks using the Dummy Plug System on Eva-01, despite Shinji's protests.
- Completely dismembered and rendered useless after the attack by the frenzied Eva-01. Pilot, luckily, survives.

Eva-04
- Equipped with experimental S2 engine, similar to that of an Angel's (allows conversion of matter into energy w/o losses)
- Initial activation at the second branch of NERV in the Nevada desert, America, goes horribly wrong. As a result NERV-02 is wiped off the map along with Unit 04, its newly installed experimental S2 engine and thousands of people.

Eva-05-13
- Have working S2 Engines
- Capable of extremely rapid regeneration much like that displayed with Unit 01
- Piloted via Dummy Plug System
- Flight Capable (that's a first...)
Pics from
http://www.lwhy.clara.net/nge/