In his last event Tsukasa struggled to play the side character, the "shadow" as the gacha title puts it. In the end he ended up overacting and taking away from the scene. This means Tsukasa is missing something to play this role...the side character.

Then we have his fes with his card being surprisingly boring (in a positive way), I think I speak for everyone when I say this isn't what a majority of people expected for him me included.

His fes story explains it as it emphasizes Tsukasa's past and his role as a big brother to Saki. It shows how his dreams at the end of the day was always to make the people close to him smile.

However there is a connexion to be made between Tsukasa's last event and Tsukasa's fes as in I think the answer for Tsukasa to act correctly as a side character in his last event lies in his fes.

Tsukasa is a method actor and that's been bashed in our heads constantly but it's also used in a narrative way to explore Tsukasa's character.

What I think Tsukasa will unearth about himself and what will push him forward into acting out side characters is his self worth.

More specifically how Tsukasa acted out as a support character his entire life.

His entire life he acted out as a support character for people who he thought suffered so much more than him.

He lived as a shadow to other people's live to the point where all he could do was play twinkle twinkle little star while waiting for his sister to come back.

His dream was based on supporting those around him

Tsukasa is always represented as a leader or "main character" that it almost seems ironic to have him play a side character but thruthfully this is the role that fits him the most.

But in forgetting that part of himself, he became egotistical and self centered but that was truly the opposite of who he truly is.

And his fes card and story shows that perfectly, he pushed himself for his sister to help her overcome her troubles even if he was in pain himself.

I'm really interest in Tsukasa's Sekai lore so I wonder what each vocaloids personality represents for Tsukasa. This is mostly an assumption tho. I didn't fully read all of Wonderland X Showtime story (cards included) so I might misinterpret some stuff.

....

Kagamine Len and Rin:

I put them together since they kinda share the same personality. Compare to their L/N or VBS counterparts the two of them seem to get along very well with non of them getting annoyed with the other. They also can be in sync at times too.

So from this I think Len and Rin are the portrayal of Tsukasa and Saki's relationship. Since they are the siblings that enjoys each other companies and very close.

MEIKO:

MEIKO is very energetic and is up to any challenges. She is also very strong. Although energetic she is still responsible and sometimes makes sure that Luka did not fall asleep randomly.

This MEIKO does feel like the competitive part of Tsukasa as both of them are up to any challenges.

Hatsune Miku:

Although Miku does share the resemblance with Emu it's still Tsukasa's Miku since she exist before Emu meets Tsukasa.

I think Miku personality comes from Tsukasa's younger times where he does his best to entertain his sister Saki to make her smile. Tsukasa must have use the onomatopoeia words when doing plays for Saki.

KAITO:

KAITO definitely is the calm and mature type of leader that looks out for everyone. I think some people did say that KAITO is what Tsukasa wants to be as a star and it does seems like that.

KAITO also feels like he took the older brother persona of Tsukasa in which KAITO looks out for other members and help WXS unit to solve their problems.

Megurine Luka:

Luka is a special case. She sleeps when everyone is having fun and awakes when she sees someone in trouble. She also listens to people problems too and gives advices to them.

I wonder Luka can be related to the part Tsukasa that gives moral support to others? Like how he does with Touya? What if Luka sleeps happily is Tsukasa being happy for the other's problems being resolve?

....

Everyone of WxS's fragment sekai is about their true desire, not just the dreams they say out loud but the things they really truly desire in their hearts.

Nene - This one is easy, she wants to go to broadway, she wants to go all over the world and sing in theatre. Therefore her sekai is a huge city with posters.

Emu - She wants to see her grandfather again and have them discuss and execute new ideas for Pheonix Wonderland and their own home.

Rui - He wants to go further with WxS, to be able to achieve the impossible with them represented by the mini-WxS wanting to go to the moon.

Tsukasa - He wants to make people smile just like he made Saki smile, he wants to help those who are struggling.

In a way those all fit the characters but it's quite interesting to see how certain ones really differ from what the characters say their dreams are.

There is also stuff to say about the new side characters that are getting introduced but i'll make a second post for that.

Tsukasa4 -> Tsukasa's efforts to play a side character is pretty thematically significant to Tsukasa whose all thing is being a star, it hints at a potential realisation that for Tsukasa being a star doesn't mean being the main character.

Emu5 -> Emu learns how to express herself through a role, this is both technical and hints at emotional improvement for Emu. It's pointed out that Emu has a hard time expressing herself despite being good at understanding people's emotions. She asks people's perspective about how better to express her role and this will be both useful for her future career but also it's 100 pourcent linked with Emu's own emotional troubles to express how she feels.

Rui4 -> ??????

Yeah the issue is Rui4 so far the only event that is extremely weird about it. Tsukasa4 may have ended with a somewhat failure/cliffhanger ending but there was definitely a clear destination/goal. Rui4 never really expresses what lesson Rui should've learned despite there being hints that i've talked about before.