Dragon Quest had an actual quest to go with it, but I'm not sure if you are counting it the same as the others. Was similar to the Shantotto event, at least.
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We are literally in what 2 months?
If I recall correctly, the Final Fantasy XV event re-run is on September this year. Requires level 50. It gives Noctis clothes, hair, some FFXV music and the Regalia.
The Yokai may be another one who can get a re-run to add the missing weapons for reaper and sage (when they come out).
Others like NieR and Monster Hunter are permanent.
About the others, who knows.
The Yokai Watch event has been run at least three times now, with the latest adding more minions and weapons for samurai, red mage, dancer, and gunbreaker, along with another mount for collecting all 17 weapons. But I'm given to understand that Yoshi-P is a personal friend of the director of Yokai Watch, which is part of why it gets a bigger event than most crossovers, and why it keeps coming back.
I'd like an FF-VIII cross over & an FF-VII cross-over!
Also, an FF-X cross-over
For FF-VIII maybe you're visited by Rinoa Heartilly, since she is a *spoiler alert*
Sorceress
But I'd want a cross-over really only if we get female character glamours as well as male ones, not one male glam or one female glam fits all--- but an idea for another car mount only this time from FF-VIII; one of the fancy ones you can ride along in or maybe a Balamb Garden mount or Ragnarok mount
A Quistis & an Irvine or Zell hairstyle
Quistis outfit
Rinoa Heartilly Pinwheel skin for dancer rings?
Sorceress Edea Minion
TT cards
For an FF-VII event
Aerith could visit WoL something about remnants of Genova
but the quest rewards could be Aeriths Hair or Tifa's & Vincents hair or Sephiroths hair
Tifa's original outfit (not her AC one), Clouds original outfit
Maybe a special Chocobo 2-seater mount
For an FF-X cross-over I'd hope for Yuna's wedding dress & her wedding hair
Yuna's signature earring & original hairstyle As well as one of her staves for a skin for WHM
Aurons hair (if we don't already have it) His glasses & Coat
Valefor as a mount (Yuna uses Valefor to catch her to escape her forced marriage so why not have her as a mount?)
I just don't want an event that gives only male glamour or only female glamour because that imo would lowkey alienate some people? idk, that might be really reaching. I know not everyone was onboard with the 2-B dress being released without 9s outfit so I'm going by that-
I didn't participate in the FFXV cross-over event because I didn't care for any of the loot or the game itself (Yes, I know the mount was a 4-seater but I didn't like the car design. Noctis' emo hair & his outfit wasn't my taste either. I'd hoped it'd introduce Lunafreya's hair & her dress, too.)
I would like to see Yuna's wedding dress also, but I'm more interested in the X-2 outfits
Also the crossover could introduce a new species. Ronos.
If they do add Lunefreya's clothing. Her dress would look good with Lightnings XIII hairstyle. (If I buy the Lightning Guardian Corps look)