All I remember is there's these 4 or 5 guys that can transform into different types of dragon (red, green, black, etc). These dragons are long, slim, and huge. I'm very certain it's an anime from Japan in 80s or 90s.

I want to say all of these guys tries to protect a girl, and they transform by touching their earrings. (0.1% sure on this :( )

Sounds like,.

The Legend of the 4 Kings


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That's the one.. thanks a lot! :D