Picking a Class given your Culture
Culture and class prevalences are not absolute, but are useful in understanding what cultures are like. They also imply familiarity with your class (or not) when you encounter a culture.
Picking a "rare" match, or especially a "none" match, is something for you and your GM to think and talk about. How and why did your character come to be such an unusual character class, given the culture you are from?
Note that Raios is a game-system-agnostic setting, so that people can play in Raios no matter the game system they are running. Because of this, the classes listed below don't exactly match the character classes of specific games. But we went with general descriptors of professions which are hopefully distinct and comprehensible enough that you can map them to specific classes in the game you are playing. Also, of course, there can be large differences between cultures even within these professions. An Arn longbowman is very different from a Sareisi horse Archer. Valtauri Elf spear fighters are very different from Valmyrri Elf fencers or Kharg Dwarf heavy infantry.
Common: Divine Caster, Scout
Uncommon: Arcane Caster, Barbarian, Bard, Knight, Martial Artist, Occult Caster, Shaman
Rare: Druid, Elementalist, Scientist
None:
Common: Arcane Caster, Bard, Divine Caster, Scout
Uncommon: Druid, Scientist
Rare: Barbarian, Elementalist, Martial Artist, Occult Caster, Shaman
None:
Common: Bard, Scout
Uncommon: Arcane Caster, Barbarian, Elementalist
Rare: Divine Caster, Knight, Occult Caster, Scientist, Shaman
None: Martial Artist
Common: Arcane Caster, Bard, Divine Caster, Knight, Occult Caster, Scientist, Scout
Uncommon: Martial Artist
Rare: Barbarian, Druid, Elementalist
None: Shaman
Common: Scout, Shaman
Uncommon: Divine Caster, Rogue
Rare: Archer, Druid, Elementalist
None: Arcane Caster, Bard, Knight, Martial Artist, Occult Caster, Scientist
Common: Arcane Caster, Archer, Divine Caster, Elementalist, Fighter, Occult Caster, Ranger, Scientist, Scout
Uncommon: Druid
Rare: Barbarian
None: Knight, Martial Artist, Shaman
Common: Ranger, Scout, Shaman
Uncommon: Archer, Divine Caster
Rare: Arcane Caster, Bard, Druid, Elementalist, Knight, Martial Artist, Occult Caster, Scientist
None:
Common: Arcane Caster, Archer, Ranger, Scout
Uncommon: Bard, Divine Caster, Druid, Occult Caster, Rogue
Rare: Knight, Martial Artist, Scientist, Shaman
None: Barbarian
Common: Knight, Ranger, Scout
Uncommon: Archer, Scientist
Rare: Arcane Caster, Barbarian, Bard, Druid, Elementalist, Martial Artist, Occult Caster
None: Shaman
Common: Knight, Scout
Uncommon: Archer, Ranger, Scientist
Rare: Arcane Caster, Barbarian, Bard, Druid, Elementalist, Martial Artist, Occult Caster
None: Shaman
Common: Arcane Caster, Bard, Divine Caster, Knight, Ranger, Scientist, Scout
Uncommon: Occult Caster
Rare: Barbarian, Druid, Elementalist
None: Martial Artist, Shaman
Common: Elementalist, Occult Caster, Scientist, Scout
Uncommon: Archer, Divine Caster, Martial Artist, Ranger
Rare: Bard, Druid, Knight
None: Barbarian, Shaman
Common: Archer, Occult Caster, Scout
Uncommon: Barbarian, Bard, Divine Caster, Martial Artist, Ranger, Shaman
Rare: Arcane Caster, Druid, Elementalist, Scientist
None: Knight
Common: Archer, Druid, Scout, Shaman
Uncommon: Bard, Divine Caster
Rare: Arcane Caster, Elementalist, Occult Caster, Rogue
None: Knight, Martial Artist, Scientist
Common: Archer, Divine Caster, Scout
Uncommon: Arcane Caster, Barbarian, Bard, Druid
Rare: Elementalist, Occult Caster, Shaman
None: Knight, Martial Artist, Scientist
Common: Divine Caster, Druid, Fighter, Scout
Uncommon: Rogue, Scientist
Rare: Arcane Caster, Elementalist
None: Barbarian, Knight, Martial Artist, Occult Caster, Shaman
Common: Bard, Divine Caster, Scout
Uncommon: Druid, Rogue
Rare: Elementalist, Scientist
None: Barbarian, Knight, Martial Artist, Occult Caster, Shaman
Common: Bard, Divine Caster, Elementalist, Occult Caster, Scientist, Scout
Uncommon: Knight
Rare: Druid, Martial Artist
None: Barbarian, Shaman
Common: Bard, Divine Caster, Druid, Scout
Uncommon: Elementalist
Rare: Barbarian, Knight, Martial Artist, Occult Caster, Scientist, Shaman
None:
Common: Scout
Uncommon: Divine Caster, Druid, Occult Caster, Scientist
Rare: Arcane Caster, Elementalist, Shaman
None: Barbarian, Knight, Martial Artist
Common: Archer, Barbarian, Occult Caster, Scout
Uncommon: Bard, Divine Caster, Elementalist, Martial Artist, Shaman
Rare: Arcane Caster, Druid, Knight
None: Scientist
Picking a "rare" match, or especially a "none" match, is something for you and your GM to think and talk about. How and why did your character come to be such an unusual character class, given the culture you are from?
Note that Raios is a game-system-agnostic setting, so that people can play in Raios no matter the game system they are running. Because of this, the classes listed below don't exactly match the character classes of specific games. But we went with general descriptors of professions which are hopefully distinct and comprehensible enough that you can map them to specific classes in the game you are playing. Also, of course, there can be large differences between cultures even within these professions. An Arn longbowman is very different from a Sareisi horse Archer. Valtauri Elf spear fighters are very different from Valmyrri Elf fencers or Kharg Dwarf heavy infantry.

Ansharri Human
Very common: Archer, Fighter, Ranger, RogueCommon: Divine Caster, Scout
Uncommon: Arcane Caster, Barbarian, Bard, Knight, Martial Artist, Occult Caster, Shaman
Rare: Druid, Elementalist, Scientist
None:

Arn Human
Very common: Archer, Fighter, Knight, Ranger, RogueCommon: Arcane Caster, Bard, Divine Caster, Scout
Uncommon: Druid, Scientist
Rare: Barbarian, Elementalist, Martial Artist, Occult Caster, Shaman
None:

Ceodari Human
Very common: Archer, Druid, Fighter, Ranger, RogueCommon: Bard, Scout
Uncommon: Arcane Caster, Barbarian, Elementalist
Rare: Divine Caster, Knight, Occult Caster, Scientist, Shaman
None: Martial Artist

Chuuli Human
Very common: Archer, Fighter, Ranger, RogueCommon: Arcane Caster, Bard, Divine Caster, Knight, Occult Caster, Scientist, Scout
Uncommon: Martial Artist
Rare: Barbarian, Druid, Elementalist
None: Shaman

Draorn Beastman
Very common: Barbarian, Fighter, RangerCommon: Scout, Shaman
Uncommon: Divine Caster, Rogue
Rare: Archer, Druid, Elementalist
None: Arcane Caster, Bard, Knight, Martial Artist, Occult Caster, Scientist

Garuun Gnome
Very common: Bard, RogueCommon: Arcane Caster, Archer, Divine Caster, Elementalist, Fighter, Occult Caster, Ranger, Scientist, Scout
Uncommon: Druid
Rare: Barbarian
None: Knight, Martial Artist, Shaman

Half-Ghruz Orc
Very common: Barbarian, Fighter, RogueCommon: Ranger, Scout, Shaman
Uncommon: Archer, Divine Caster
Rare: Arcane Caster, Bard, Druid, Elementalist, Knight, Martial Artist, Occult Caster, Scientist
None:

Herukh Human
Very common: Elementalist, FighterCommon: Arcane Caster, Archer, Ranger, Scout
Uncommon: Bard, Divine Caster, Druid, Occult Caster, Rogue
Rare: Knight, Martial Artist, Scientist, Shaman
None: Barbarian

Kharg Dwarf
Very common: Divine Caster, Fighter, RogueCommon: Knight, Ranger, Scout
Uncommon: Archer, Scientist
Rare: Arcane Caster, Barbarian, Bard, Druid, Elementalist, Martial Artist, Occult Caster
None: Shaman

Kharz Dwarf
Very common: Divine Caster, Fighter, RogueCommon: Knight, Scout
Uncommon: Archer, Ranger, Scientist
Rare: Arcane Caster, Barbarian, Bard, Druid, Elementalist, Martial Artist, Occult Caster
None: Shaman

Kishari Human
Very common: Archer, Fighter, RogueCommon: Arcane Caster, Bard, Divine Caster, Knight, Ranger, Scientist, Scout
Uncommon: Occult Caster
Rare: Barbarian, Druid, Elementalist
None: Martial Artist, Shaman

Movori Human
Very common: Arcane Caster, Fighter, RogueCommon: Elementalist, Occult Caster, Scientist, Scout
Uncommon: Archer, Divine Caster, Martial Artist, Ranger
Rare: Bard, Druid, Knight
None: Barbarian, Shaman

Mu Human
Very common: Fighter, RogueCommon: Archer, Occult Caster, Scout
Uncommon: Barbarian, Bard, Divine Caster, Martial Artist, Ranger, Shaman
Rare: Arcane Caster, Druid, Elementalist, Scientist
None: Knight

Ranfaroth Centaur
Very common: Barbarian, Fighter, RangerCommon: Archer, Druid, Scout, Shaman
Uncommon: Bard, Divine Caster
Rare: Arcane Caster, Elementalist, Occult Caster, Rogue
None: Knight, Martial Artist, Scientist

Sareisi Human
Very common: Fighter, Ranger, RogueCommon: Archer, Divine Caster, Scout
Uncommon: Arcane Caster, Barbarian, Bard, Druid
Rare: Elementalist, Occult Caster, Shaman
None: Knight, Martial Artist, Scientist

Shenn Halfling
Very common: Archer, Bard, RangerCommon: Divine Caster, Druid, Fighter, Scout
Uncommon: Rogue, Scientist
Rare: Arcane Caster, Elementalist
None: Barbarian, Knight, Martial Artist, Occult Caster, Shaman

Valaeri Elf
Very common: Arcane Caster, Archer, Fighter, RangerCommon: Bard, Divine Caster, Scout
Uncommon: Druid, Rogue
Rare: Elementalist, Scientist
None: Barbarian, Knight, Martial Artist, Occult Caster, Shaman

Valmyrri Elf
Very common: Arcane Caster, Archer, Fighter, Ranger, RogueCommon: Bard, Divine Caster, Elementalist, Occult Caster, Scientist, Scout
Uncommon: Knight
Rare: Druid, Martial Artist
None: Barbarian, Shaman

Valtauri Elf
Very common: Arcane Caster, Archer, Fighter, Ranger, RogueCommon: Bard, Divine Caster, Druid, Scout
Uncommon: Elementalist
Rare: Barbarian, Knight, Martial Artist, Occult Caster, Scientist, Shaman
None:

Varynn Halfling
Very common: Archer, Bard, Fighter, Ranger, RogueCommon: Scout
Uncommon: Divine Caster, Druid, Occult Caster, Scientist
Rare: Arcane Caster, Elementalist, Shaman
None: Barbarian, Knight, Martial Artist

Veng Human
Very common: Fighter, Ranger, RogueCommon: Archer, Barbarian, Occult Caster, Scout
Uncommon: Bard, Divine Caster, Elementalist, Martial Artist, Shaman
Rare: Arcane Caster, Druid, Knight
None: Scientist