Leonin have lifespans similar to humans, although culturally they are considered adults at the age of 16.

Your Strength score increases by +2, and your Charisma score increases by +1

Leonin have a strong sense of honor and loyalty, and as such tend to follow the tenets of good and law.

Leonin are taller and heavier than humans, standing well over 6 feet tall and averaging around 250 pounds. Your size is Medium.

Your Base walking speed is 30 feet.

You have a cat’s keen senses, especially in the dark. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light.  You can’t discern color in darkness, only shades of grey.

You issue forth a primal roar, forcing each creature within a 30 foot cone to make a Wisdom saving throw (DC 8 + your proficiency + your Charisma modifier). A target automatically saves if it can’t hear or see you. On a failed save, the target becomes frightened of you for one minute. If the frightened target takes any damage, the effect ends.  It can make a new save at the end of it's turn. You can use this ability once per long rest.

Your natural strength and endurance give you proficiency on athletics checks.

Your claws are natural weapons, which you can use to make unarmed strikes. On a hit, you deal slashing damage equal to 1d4 + your strength modifier, instead of the bludgeoning  damage normal for an unarmed strike.

You not only resemble a lion, you're as brave as one too.  You have advantage on saving throws against fear effects.

You can speak, read and write in Common and one other language of your choice.