You can transfer a level 8 character.
You won't be able to transfer from one world to another if:
1 - The character has a black or red skull
2 - Your account has orange, red or black rule violation record.
3 - The character owns a house
4 - The character is the leader of a house
5 - The character has Tibia coins offers at the market
6 - The character residence is Dawnport or Rookgaard.