One subclass that has really grown on me is the Bladesinger wizard. I love the changes they made in reprinting it from SCAG to Tashas. One area that I think Tasha's falls short compared to SCAG is it no longer features the flavor tidbit on the different styles of bladesinging. This gave me the idea for an optional feature gained at 2nd level that would allow a player the chance to gain some mechanical benefit based on their chosen style. Let me know what you think:

Bladesinger Style

2nd-Level Bladesinger Wizard feature

Bladesingers have developed a number of traditional styles since the founding of the practice. These styles can be widely grouped into three families: Cat, Bird, and Snake. When you choose this tradition at 2nd level, select one of the three bladesong styles to adopt. You gain one of the following benefit based on your chosen style:

Cat: Styles that use a sword belong to this family. 

• Lion: You learn the Dueling fighting style

• Leopard: You learn the Disguise Self spell and it does not count against the number of spells you know. You can cast Disguise Self at 1st level without expanding a spell slot. Once you do so you must complete a long rest before it can be cast this way again.

• Red Tiger: You learn the Blade Ward and Sword Burst cantrips.

Bird: Styles that focus on the use of hafted weapons, such as axes and hammers, belong to this family. 

• Eagle: You learn the Thrown Weapon Fighting fighting style. 

• Raven: You learn the Expeditious Retreat spell and it does not count against the number of spells you know. You can cast Expeditious Retreat at 1st level without expanding a spell slot. Once you do so you must complete a long rest before it can be cast this way again.

Snake: Styles that focus on the use of a flail, chain, or whip belong to this family.

• Pit Viper: You learn the Poison Spray cantrip. Additionally, when you cast a spell which deals poison damage you can reroll any roll of 1 on the poison damage dice, but you must use the new roll, even if it is another 1. 

Each family has a particular group of weapons which is bound to the tradition of its styles, but using those weapons are not necessary to benefit from that bladesong style.

The Bladesinger is not a subclass I think needs any sort of buff, but I thought these would be fun mechanical ways to reflect the flavor presented in SCAG without requiring the player to take any extra feats or multiclass. 

While thinking of this, I also had a few fun ideas for other styles and their potential benefits. Homebrew on top of homebrew, if you will

Possible Additional Styles (brings each family to having three styles each)

Vulture: Belonging to the bird family of styles, practitioners of the vulture style are generally regarded as cowardly and dishonorable. This style focuses on use of sickles and practitioners will train in using necromancy magic to weaken their foes before sweeping in to strike. 

Benefit from feature: Learn the Chill Touch cantrip and can reroll 1s on spells that deal necrotic damage

Cobra: Belonging to the snake family of styles, practitioners of the cobra style favor using enchantment magic to charm their enemies into a calm state before striking viciously. 

Benefit from feature: Gain advantage on attack rolls against a creature charmed by you. 

Boa: Belonging to the snake family of styles, practitioners of the boa style favor mixing grapples into their weapon attacks. 

Benefit from feature: When you make an attack with a weapon in one hand, you can use a bonus action to attempt to grapple a creature if your other hand is free. While your bladesong is active, you can use Int in place of Str for attempts made to grapple another creature.