Tavern Brawler? I fight flipping Dragons!

After fighting bears, bugbears, werebears, dragons, witches and god knows what else, punching something is very easy for you. You've become extremely accustomed to rough-and-tumble fighting using whatever weapons happen to be at hand, you gain the following benefits:

• Increase your Strength or Constitution score by 1, to a maximum of 20.
• You are proficient with improvised weapons.
• Your unarmed strike uses a d4 for damage at Level 1, 1d6 at level 5, 1d8 at level 10, and 2d8 at level 15.
• When you hit a creature with an unarmed strike or an improvised weapon on your turn, you can use a bonus action to attempt to grapple the target
• Your unarmed strikes count as melee weapons for the purposes of class abilities.