Ishizu Ishtar becomes available character by completing unlock missions. She appears in the Gate after you finish a trigger event, then you can have a duel against him and challenge missions to unlock her.
If there is inaccuracy, kindly let us know correct information by submitting comments or screenshots to a thread at the bottom of the page.
Summon LIGHT-Attribute monster(s) 200 time(s) in total
It does not count Set, Flip Summon, and Special Summon (unconfirmed).
Summoning a Light-Attribute monster in PVP Duels including, Ranked Duels, Casual Duels, and Friend Duels, is counted (unconfirmed).
Ishizu unlock missions
Win a Duel against Ishizu Ishtar with at least 6000 LP remaining.
Win a Duel against Ishizu Ishtar at Level 30 in Duel World.
Complete all Character Unlock Missions.
Stone of Spell x3
Let's use Light monsters from the beginning
Here is a list of Light-attribute monsters that are easy to get and available from the early stage of the game. Build a deck that contains those monsters and summon them as much as you can even in the initial phase. See also the following 2 tricks:
Do not set, flip summon, or special summon them. It is said that only normal summon is applicable although that is unconfirmed.
If your Monster Zone is full with LIGHT monsters, conduct tribute summon. Or switch their battle position to defense, then standard duelists will attack your monster that have low DEF, and you can summon the next one.
Set LP Boost skills to your deck and use cards that regenerate your Life Points to complete one of Ishizu unlock missions, win a Duel against Ishizu with at least 6000 LP remaining. Joey, Tea, and Mai can acquire LP Boost skills by leveling up, and other also can acquire them as drop (duel reward) skill.
[LP Boost α] Increases starting Life Points by 1000.
I was as desprate as some of you are to get this b*tch unlocked. I started with a deck full of light monsters. Did like 300-400 summons. NOTHING happened. Then I read that you have to summon 1 Light Monster 200 times. I switched to a normal beatdown deck with 3 Summoners (search for Guardian) and 1 Guardian (normal light 1650ATK). I did like 15 duels against Standart Duelists summoning the Guardian nearly every time.
Suddenly Ishizu unlocked!
So i can tell that you dont have to summon 1 Light Monster 200 times, at least not the same one, cause i didnt. Also it does not make a difference if you play effect or normal monsters. The only thing i am unsure of is if Tributing counts. In my case i think it didnt, so i ended up having 190 or so summons without tributing included when i switched to the "normal" deck.
This was by far the worst thing to unlock and do in the whole game. So i hope it might help some people.
Maybe she is simply bugged and glitched as hell and you never know when you will unlock her. (also possible)
I'm not sure, but I don't think legendary duels count. I'm using a fairy/light deck only in legendary duels and I haven't got her. I have counted at least a hundred normal-summoned light-monsters in the last 10 duels. I've got at least 110 duels with Tea and this deck. Even in the profile, it's look like I'm only using dark monsters (the deck that I'm using in standard duels). I thought about 2 possibilities: they cannot been sent to cemitery or legendary duels don't count. Any help?
I'm honestly at my wits end with this character. I've used nothing but a light monster deck on low level legendary characters in the gate. Normal/tribute summoned over 300 monsters, spent well over 500 gate keys and even went from level 27-30 on Mako trying to unlock her so I can move on to the next stage.
Finally unlocked her. I started at just around 2500 normal summons, and ended at over 3000. It's a possibility that tribute summons don't count? As other than that, I was purely normal summoning 4 star light cards.
Does it have to be pvp or can it be standard duels? Please help someone who managed to unlock!!:))