First let’s start at the beginning with Oliver Queen aka The Green Arrow

Second, we have Sara Lance AKA Black Canary

But lets not forget that Laurel Lance takes over her sister’s role when Sara is killed by Oliver’s sister.

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Source: gr.ign.com

Next comes Roy Harper or better known as Arsenal.

Meanwhile, in Central City, a freak accident turns Barry Allen into The Flash.

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Source: uncannyknack.deviantart.com

The freak accident also creates Firestorm

Then in comes Ray Palmer aka ATOM

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Source: nerdist.com