Create a ":ninja/element" attribute that gives some ninjas an advantage in combat

[CFiggers]

At some point, Ninjas will be able to get an advantage when fighting another ninja who is weak against their element, or by being supported by a ninja whose element supports theirs.

Fire -[beats]-> Wind -[beats]-> Lightning -[beats]-> Earth -[beats]-> Water -[beats]-> Fire

Fire <-[strengthens]- Wind <-[strengthens]- Lightning <-[strengthens]- Earth <-[strengthens]- Water <-[strengthens]- Fire

Ideas:

• Perhaps most :genin do not know what their element is yet/are not able to get advantage of it.
• Perhaps specific :ninja/special's are only possible for ninja with a specific element.
• Perhaps more than one element is possible in rare cases or with specific :ninja/special's.