@Leon Castle
Djeeta is the female version of the Main Char in Granblue Fantasy.
As for Forte iirc she is a Rage of Bahamut char and yes she is obtainable in GBF. There's also some stuff from Shadowverse that is in Granblue.
https://gbf.wiki/Forte
Karyl is also obtainable in GBF
https://gbf.wiki/Karyl
They did add plenty of side stories (aka older events that are now permantly available)
As for Granblue the spark happens at 300 pulls (so you need 90k crystals which is easy to get)
But then again Granblue also gives away a lot of free stuff over the year from crystals to weapons and etc.
Something else that's only in Granblue is the Roulette which is a login event where you get around 10,20 or 30 pulls for free. (Last roulette just did end a few days ago)
The roullette also has Gachapin aswell as a small chance to get 100 or 200 pulls for free. (Gachapin is draw until you get one SSR which depends on how lucky/unlucky you are so it could be just a 10 pull or going up to 100.) As for the SSR you get it's random you could get a new char which are tied to a wepaon or just get an old weapon and a gold moon. (Something you can trade in for other stuff)
Granblue does have Legend Festival or Legfest
Which is a sorta special "banner" in the sense it happens at the end of each month and the SSR rates are bumped up.
During that you can get some Grand characters aswell as a Divine General (Makura is one of them)
However Divine Generals have a special rule applied to them:
Quoted dirrectly from the wiki:
The 12 Generals (also referred to as Zodiac characters) are obtainable for the year they are introduced. They are then removed from the Premium Gala character pool at the end of the year, and return to the pool after roughly another year. For example, Anila was introduced in 2015, was unavailable in 2016, and became obtainable again in 2017. Note that even in years they are available, not all 12 Generals will be available in each Premium Gala. If the one you want is not available in a Premium Gala banner, it may come back in another.
During the middle of the month there is Flash Gala which has another set of Grand chars.
In some cases the weapon of a Grand char is more used than the char itself.
And they also did divide the drawing into normal and classic so the pool is less large now.
I hope i got that right if not @ASilverSeraphim check over what i wrote and add in anything i might've missed or explaind wrongly.
@Leon Castle In case you wonder he's a fellow Granblue Fantasy player and i'd say he's more knowledgeable about stuff.