Sachiel
Sachiel is the first Angel to assault Tokyo-3 following the destruction of Adam, though it's fifteen years after the second impact before Sachiel attacks the city. Why the long wait is a mystery, though its been rumoured that the Angels laid dormant on Earth until the second impact which some how awoke them from their dormancy.  Like the Angels to follow, Sachiel challenges NERV alone, there would appear to be no systematic organisation amongst the Angels.

Sachiel is extremely well suited to the role of assaulting the enemy being equipped to despatch of both long range and close combat opponents.  Sachiel's armament includes that of two ramming devices built into the palm of both hands, capable of delivering an incredible amount of pressure, and some kind of launcher mechanism used for projecting a type of high yield energy projectile with an unprecedented blast radius across long distances.  This aside, however, Sachiel's AT field isn't as powerful as those exhibited by many of the other Angels, and the Angel's agility is mediocre at best, though Sachiel's extraordinary strength, ability to skim across surfaces and powers of regeneration more than makes up for this.
Originally Sachiel was a cherub that lived in the first Heaven and presided over the planet Jupiter. Some believe that Sachiel fell at the time of Satan's being cast out of Heaven, and now serves as one of the four sub-princes of Hell. In the T.V. series, the alien named after Sachiel appears in episode one, and is the first of the angels to reach Earth in 2015 A.D. NERV is hardly prepared. Rei, the 'first child', was injured in combat against Sachiel in the very beginning of the episode, when Shinji first sees Sachiel and Unit-01 fighting. Shinji, the 'third child' is thrust unwillingly into Unit-01, which he can hardly even make walk. He is forced to fight a monster that gives his Eva a severe thrashing, and impales his Eva with its pile driver attack. Sachiel's eye beam weapon is also extremely effective. When all looks like it is lost, Shinji passes into a different state of consciousness, and his Eva, Unit-01, goes berserk, attacking Sachiel with abandon and defeating it. Sachiel, facing evisceration by Unit-01, self destructs instead.