I feels Joey's ace monster is Time Wizard due to fact it has helped him out of binds and it was given to him by Yugi himself as symbol of their bond

Tea's ace monster was "Shining Friendship" because it allows her to go into her main win condition of talking about friendship until the opponents can't take it anymore, and surrender.

Time Wizard basically being a luck based monster and Joey being the luckiest duelist ever definitely matches up

Having Revival Jam for Marik's/Yami Marik's ace actually make a good amount of symbolic sense. Revival Jam is a type of slime, and the main quality of slime is how moldable it is, you can shape it into almost anything, it can BECOME almost anything. The source of Marik's conflict is that the situation of his life stops him from being anything other than a Tombkeeper, he wanted to see more of the world, he wanted to make more of himself other than the role he was born into, but he couldn't, and that in turn gave birth to Yami Marik.

To Marik, Revival Jam represents what he can never be, and to Yami Marik, Revival Jam represents the desire that essentially brought him to life.

For Bakura it is noted that even if Dark Bakura was not controlling him Necrofear would still be an ace for Bakura as he canonically likes creepy occult monsters and she would definitely be a pay off for him. We also discover from Rush Duel that the being on Change of Heart is a demon that looks like an angel.

Not only is Red Eyes Black Dragon the embodiment of potential but also change and teamwork! Just look at how many monster Red Eyes can fuse with in contrast to Blue Eyes who only seems to be able to fuse with other blue eyes.

I think Summoned Skull deserves a mention as well.

In the manga Yugi used it as his ace in his first duel against Kaiba - before he got the deck of his grandpa (or Kaiba his three Blue-Eyes). He also used it in his first duel against Pegasus (the VHS one) to win the game (sadly the timer ran out) - and he also used his own cards rather than his grandpa's deck as well.

Later during the cermonial duel between Yugi and Atem - while Atem used the Dark Magician Yugi got to use Summoned Skull.

Summoned Skull got overshadowed a lot by the Dark Magician but I do think it is rather notable that it was Yugi's card from the very beginning before the Dark Magician was even a thing and managed to stick around until the very end

Fun fact: we DID actually get a backstory for Rex’s love of Dino cards.
It’s the first time he say “Hi. I’m Rex Raptor.”

Elemental HERO Flame Wingman was Jaden Yuki's Ace in the first season of YGO: GX until he found the Neo Spacian archetype in some outer space dimension or something, thus meeting Elemental HERO Neos, which became his top Ace for the rest of the series.

6:17-Supposedly Joey became Takahashi's favorite character out of the OG main cast and said if the story continued to follow them, he would eventually surpass Yugi and became the next King of Games. Supposedly a hint at this was in 5d during a quick line when someone remarks in disbelief that the great Joey Wheeler is on the tourney ab of it to happen before someone corrects that it is just his cousin. This was only in the dub as far as I've heard and thus is not cannon, though.

If it hasn't been said already in the comments I think Joey chose red eyes as his ace because thats his symbol/reward for his first duel where he won all himself without yugi backseat dueling

I feel that Red eyes being potential makes even more sense when you remember that Joey won Red eyes in a duel where he wasn’t allowed any help from Yugi showing that he’s growing as a duelist

Yugi has a ton of Blue Eyes + Dark Magician support in his decks towards the later seasons. The future video would have a lot of basis for the way his deck shapes up.

The panik ace card is genuinely so spot on. Panik would literally use scare tactics to win duels. Overwhelm i think was the word they literally used in the show. Than if i recall correctly, yugi finally dueled him, was NOT scared at all since he saw through his... "Illusion" .. and panik started to "panik" him self. Its been awhile, im a bit fuzzy but i love duelist kingdom so, ive watches it a bunch. Just jot very recently, feel free to correct me lol

I really like to think that little yugi’s ace is Gandora or the silents because during the dawn of the duel arc his last card was gandora and silent swordsman. Even when he was dueling Atem he still pulled out the silents and Gandora

I think Lava Golem could be a honourable mention/option for Yami Marik; it's a staple in his deck in Yu-Gi-Oh video games like Nightmare Troubadour and World Championship, plus it's quite fitting to showcase his manipulative and sadistic side as shown in his duel against Joey (also Lava Golem is the card sleeve you unlock in Duel Links after you duel 100 times as Yami Marik)!

Yugi has technically used Blue-Eyes several times. He did it against Kaiba's dead/ghostly side, and also in the virtual world arc, where he made Ultimate's attack 9000.

Joey’s ace is obviously Time Wizard, he almost always uses this card in a pinch to save the day. Not to mention that it’s a special card given to him by his best friend

Joey's ace monster is for sure time wizard. the embodiment of luck

I feel like there's also a small case for Time Wizard being one of Joey's aces, especially given how many times he wins Time Roulette.