1st Angel: Adam. Typical Battle Form: Bigass Giant of Light that looks 
suspiciously like Unit-01.

2nd Angel: Lilith. Typical Battle Form: Well, Lilith's Angel form is 
that of a large pale white giant with a black mask decorated with a 
"Seven-Eye" pattern, but that form is basically defunct; Lilith's 
sentience is the mind of Ayanami Rei.

3rd Angel: Sachiel. Since Sachiel fought directly in the series, I'll 
assume you know what he looks like--same with all the other Angels. 
^_^ This is mostly to identify them by number. Just as a side note, 
Sachiel is the first one to attack Tokyo-3.

4th Angel: Shamshel.

5th Angel: Ramiel.

6th Angel: Gaghiel.

7th Angel: Israfel.

8th Angel: Sandalphon.

9th Angel: Matarael. (Yes, I know, I misspelled this earlier, same 
with #10. ^^;;;)

10th Angel: Sahaquiel.

11th Angel: Ireul. (Ireul is sort of invisible; he appears as a 
corrosive substance which eventually evolves into a computer virus. o.O)

12th Angel: Leliel.

13th Angel: Bardiel. (Bardiel is parasitic; the most one sees of his 
form is a mass of gooey liquid attached to Eva-03.)

14th Angel: Zeruel.

15th Angel: Arael.

16th Angel: Almisael.

17th Angel: Do I really need to say it? ^_^ [Edit: That's Tabris, 
for you ignorant folks who haven't watched NGE that far.]

18th Angel: Rogziel.

19th Angel: Again, you should know this one....^_- [Edit: Malachi
of EVA-R.]

20th Angel: Uriel, AKA our own Jen-chan! :D

21st Angel: Sariel, Jen's "mother", who is listed as 21 since Jen was 
discovered before she was. ^_^