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 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. 

I love the idea! As you said, the bladesinger doesn't need this buff from a mechanocal standpoint, but it's absolutely reasonable to allow this.

Perhaps I will use this in my campaign. Perhaps you can drop the performance skill for this? 

Probably not a bad tradeoff. Glad you like it. Any other suggestions? 

Quote from Kaboom979 >>

Probably not a bad tradeoff. Glad you like it. Any other suggestions? 

 For balance, maybe just one cantrip per subclass?  Eg. True Strike for the Lion, minor illusion for the Leopard, blade ward for the red tiger, mage hand for the Eagle, gust for the Raven, and poison spray for the Pit Viper

Quote from Yamana_Eajii >>

Quote from Kaboom979 >>

Probably not a bad tradeoff. Glad you like it. Any other suggestions? 

 For balance, maybe just one cantrip per subclass?  Eg. True Strike for the Lion, minor illusion for the Leopard, blade ward for the red tiger, mage hand for the Eagle, gust for the Raven, and poison spray for the Pit Viper

 Maybe. Personally I like the flavor of mixing in Fighting Styles or other possible spells. They may not be perfectly balanced against each other in their current form, but I feel like just one cantrip for each fighting style might be a bit boring. Thank you for the suggestion

Why bother with the text about the weapon types if you're not going to have any rules interacting with them?

I'd much rather see something like this:

Lion:  The longsword is a finesse weapon for you, and you can wield it two-handed without breaking your bladesong.

Tiger:  The rapier is a light weapon for you.

Leopard:  In your hands, scimitars gain Thrown (20/60)

Jaguar:  When you attack with a shortsword, you may deal slashing or bludgeoning damage instead of piercing.  Shortswords you attack with are considered silvered and adamantine for the purposes of overcoming damage resistances and immunities.

Cheetah:  You may draw a rapier, longsword, scimitar, or shortsword as part of the attack made with the weapon, and you can sheathe them as easily as you can drop them.  While both of your hands are empty, you can dash as a bonus action.

Snow Leopard:  While wielding rapiers, longswords, scimitars, or shortswords with which you are proficient and no other weapons, you gain proficiency in Acrobatics of you do not have it, and Expertise if you do.  During your bladesong, you can roll Acrobatics to avoid slipping on ice, rather than a dexterity save, and your intelligence bonus adds to constitution saves made to resist altitude or cold.

Cougar:  While wielding rapiers, longswords, scimitars, or shortswords with which you are proficient and no other weapons, when you have advantage on a weapon or spell attack, you crit on a 19 or higher.

Quote from quindraco >>

Why bother with the text about the weapon types if you're not going to have any rules interacting with them?

I'd much rather see something like this:

Lion:  The longsword is a finesse weapon for you, and you can wield it two-handed without breaking your bladesong.

Tiger:  The rapier is a light weapon for you.

Leopard:  In your hands, scimitars gain Thrown (20/60)

Jaguar:  When you attack with a shortsword, you may deal slashing or bludgeoning damage instead of piercing.  Shortswords you attack with are considered silvered and adamantine for the purposes of overcoming damage resistances and immunities.

Cheetah:  You may draw a rapier, longsword, scimitar, or shortsword as part of the attack made with the weapon, and you can sheathe them as easily as you can drop them.  While both of your hands are empty, you can dash as a bonus action.

Snow Leopard:  While wielding rapiers, longswords, scimitars, or shortswords with which you are proficient and no other weapons, you gain proficiency in Acrobatics of you do not have it, and Expertise if you do.  During your bladesong, you can roll Acrobatics to avoid slipping on ice, rather than a dexterity save, and your intelligence bonus adds to constitution saves made to resist altitude or cold.

Cougar:  While wielding rapiers, longswords, scimitars, or shortswords with which you are proficient and no other weapons, when you have advantage on a weapon or spell attack, you crit on a 19 or higher.

 This seems like an odd take to me.

1) At least for lion, giving the player the Dueling fighting style does improve their ability to use a longsword with one hand. The same goes for the thrown weapon fighting style improving an eagle style bladesongs ability to throw light hammers. Its true that I do not have something for every single type of weapon, but alot of the spells chosen are meant to highlight the types of fighting those styles engage in (defensive and then burst for Red Tiger, reliance on illusion for Leopard, etc.)

2) I do not know how deep the bladesong lore goes, but based solely on what is mentioned in SCAG for 5e most of those styles you brought up (Cougar, Cheetah, etc) do not necessarily exist, so that is why I did not account for them. 

The idea of changing the weapon properties is interesting though, and I will consider it. That being said, as certain bladesinging styles also are said to rely on certain types of magic, I think that having some styles focus on getting a magic boost through extra spells is just as worthwhile as modifying their interaction with their weapon. 

I appreciate the feedback