There are 18 Angels listed in my source files, and I will try
to give you enough clues about it. All of these Angels appear
in the anime series, manga and also the movies.
Angel : Adam
First time found in Antarctica and issued to be the cause of Second
Impact. It has a similar shape with EVANGELION but it's glowing
bright like a flare. Indeed Adam was used as the model for EVANGELION.
In the 8th episode, Adam was somehow rebirth in form of embryos.
As Kaji said, when
an Angel approaches Adam, the Third Impact will happen.
2nd Angel : Lilith
It has seven eyes and often percept as Adam, until Kaoru
saw it and realizes it was actually Lilith. This Angel was being
crucified in Terminal Dogma stabbed with Lance of
Longinus. Lilith is very useful in the development of EVANGELION,
its blood, used as liquid oxygen inside the entry plug, called
L. C. L. That's why Shinji often smells blood inside
the entry plug.
Angel : Sachiel >>
The first Angel that strikes after the Second Impact. This Angel
makes EVA 01 get berserk for the very first time.
4th Angel : Shamshiel
5th Angel : Ramiel
6h Angel : Gaghiel
An underwater Angels which was defeated by Asuka
(backed up by Shinji)
in her first strike.
7th Angel : Israfel
Twin Angels which have 2 cores. In order to destroy it at once,
Shinji and Asuka have to learn synchronic 'dance' (i think they
work pretty good together, though they might never gonna admit
8th Angel : Sandalphon
9th Angel : Matariel
10th Angel : Shaquiel
11th Angel : Yrouel
The one and only Angel in form of virus, that's why EVA is not
possible to fight her. It hacked NERV's super computer MAGI
and finally defeated by Ritsuko.
12th Angel : Leliel
A strange angel in form of flying ball, it has 2 dimensional form
with 3 dimensional shadow. It sucks everything within his shadow
into another dimension called Sea of Dirac.
13th Angel : Bardiel
No one knows its real form since it possessed EVA O3 which was
piloted by Touji, and
attacked the other 3 EVAs.
14th Angel : Zeruel
15th Angel : Arael
16th Angel : Armisael
Rei (the 2nd clone) has
to sacrifice her life with self-destruct to defeat it, in order
to save Shinji and Asuka.
17th Angel : Tabris >>
The last Angel appears in anime series. It's known also as the
5th Children, Nagisa Kaoru.
This Angel learned about human feeling through Shinji and maybe
the one and only humane Angel.
18th Angel : Humanity
Angel or not, it's still a speculation. It was born when Rei united
with Lilith and destroyed everything on earth. It took every single
souls ever lived on earth (except Shinji and Asuka) and gave human
beings the meaning of life and humanity.