Tabaxi

The following information was sourced from Mordenkainen Presents: Monsters of the Multiverse and Volo's Guide to Monsters.
Created by the Cat Lord—a divine being of the Upper Planes—to blend the qualities of humanoids and cats, tabaxi are a varied people in both attitude and appearance. In some lands, tabaxi live like the cats they resemble, naturally curious and at home in playful environments. In other places, tabaxi live as other folk do, not exhibiting the feline behavior the Cat Lord intended.
Tabaxi’s appearance is as varied as their attitudes. Some tabaxi have features or patterning in their fur like tigers, jaguars, or other big cats, while others have appearances more like a house cat. Still others have unique patterns or might style their fur to their preferences — or might even be hairless!

• Ability Score Increase. Your Dexterity score increases by 2, and your Charisma score increases by 1.
• Creature Type. You are a Humanoid.
• Age. Tabaxi have lifespans equivalent to humans.
• Alignment. Tabaxi tend toward chaotic alignments, as they let impulse and fancy guide their decisions. They are rarely evil, with most of them driven by curiosity rather than greed or other dark impulses.
• Size. You are Medium or Small.
• Speed. Your walking speed is 30 feet, and you have a climbing speed equal to your walking speed.
• Cat's Claws. You can use your claws to make unarmed strikes. When you hit with them, the strike deals 1d6 + your Strength modifier slashing damage, instead of the bludgeoning damage normal for an unarmed strike.
• Cat's Talent. You have proficiency in the Perception and Stealth skills.
• Darkvision. 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 discern colors in that darkness only as shades of gray.
• Feline Agility. Your reflexes and agility allow you to move with a burst of speed. When you move on your turn in combat, you can double your speed until the end of the turn. Once you use this trait, you can’t use it again until you move 0 feet on one of your turns.
• Languages. You can speak, read, and write Common and Beast Speak.

The following information was sourced from Mythic Odysseys of Theros.
Leonin
Prides of these nomadic, lion-like humanoids rarely interact with other peoples, having all they need in their shimmering homeland and knowing the treachery of strangers. Still, some leonin wonder what lies beyond their borders and seek to test themselves in a wider world.

• Ability Score Increase. Your Constitution score increases by 2, and your Strength score increases by 1.
• Age. Leonin mature and age at about the same rate as humans.
• Alignment. Leonin tend toward good alignments. Leonin who are focused on the pride lean toward lawful good.
• Size. Your size is Medium.
• Speed. Your base walking speed is 35 feet.
• Darkvision. 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 gray.
• Claws. Your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you can deal slashing damage equal to 1d4 + your Strength modifier.
• Hunter's Instincts. You have proficiency in one of the following skills of your choice: Athletics, Intimidation, Perception, or Survival.
• Daunting Roar. As a bonus action, you can let out an especially menacing roar. Creatures of your choice within 10 feet of you that can hear you must succeed on a Wisdom saving throw or become frightened of you until the end of your next turn. The DC of the save equals 8 + your proficiency bonus + your Constitution modifier. Once you use this trait, you can't use it again until you finish a short or long rest.
• Languages. You can speak, read, and write Common and Beast Speak.

Homebrew Changes
Removal of Theros references.
Minor changes to the Language trait.