as a human, there are two ways to go.
If you want to stay sided with giants, go to filia (elf town) first, talk to the elf cheif (castena or whatever) and use the keyword: Giants and Elves.
talk to the NPC again with the same keyword, break the alliance.
Wait a RL day
Go to Vales (Giant town) and talk to their chief using the Giants and Elves keyword.
Ta-da, you now have a giant and elf card, and your character is sided with the giants.
To end up sided with the elves, same thing except go to Vales first and Filia last.
OR, on a new account (new is classified as an account with no characters on it by nexon, apparently) you can instantly make an elf/giant, but it's recommended to make human first for the obvious benefit of being able to get 3 characters.






