there is a vanguard(Ike), Arch Sage, Dragonlord, Reaver, Sentinel, Marksman, Seraph Knight, Light Priestess, Saint, Valkerie, and Black Dragon.
Beorc ( Human ) General tier 2- Marshall tier 3 dragon master tier 2 - dragon lord tier 3 Sage tier 2 - Archsage teir 3 Falcon Knight tier 1 - Seraph Knight tier 3 Halberdier tier 2 - Sentinal...
Get them to level 20 and level them up.
Through the storyline. At the beginning of part IV, Yune makes him a Vanguard.
Level up a level 20, 2nd class character. You can't do this to ike, micaiah, sothe, elincia and some other people.
If you look in your Fire Emblem handbook you can find out. But you can switch 3 times. At the third time you will switch to the strongest things in the entire game. Laguzes can't change classes