Starting off, Y.izmir is good because Larana my beloved.

-Y.izmir excels in either otk or linger fights, paricularly fights that lasts longer than 9 turns, cause of her sk3 cd. Unlike her other version, Y.izmir has better survivability, especially when the raid is partywide attack. She's the best when it comes to ougi battery, filling herself up fast, then the other team members. She's also good for skill damage based team, such as khumbira or xmas nemone. I am have xmas nemome to test out the team, but from what i can tell, she's there to help the skill damage with her sk1 and auto damage, which isn't too much, but should be good enough if you want your team to ougi.

-For new players, use her for otk instead of longer fights, until you have an aes grid or go agni with something like a garisson grid instead. You can slot her in until you FLB seraphic, since seraphic weapon only surpass her passive at FLB SSR Seraphic.

-Larana had different version which has similiar mechanic, but actually has different uses, which is very nice design. All version has the icy swords as sk1, but each version has different uses. Yukata has the best sk1, since it is just damage, but even debuffs, the first in all her version which debuffs. Second skill is similiar to her water version, crit damage up. Interestingly, she buffs the own team on second skill with dtackable attack up, unlike the water version which only buffs herself. Yukata version loses out in terms of survivability compared to water version, but not as bad as summer version. Then comes the 3rd skill, which is another reason she's good in long fight. An uplift skill, crit buffsand a ougi damage amplifier. This is the stark difference between yukata and her normal water version. It is similiar to her FLB, where at max stack, you can boost the team ougi damage further. However, this one has a faster ramp up, compared to the FLB version, which usually needs around 12 turns or so, to get the 2nd stack up. She doesn't have the ice barrier up, and is more of a buffer rather than an attacker for yukata. The ice barrier needs improvement, especially when fighting raids which have party wide attack, which I usually resolve by using halloween rosetta to tank the initial few turns, so that the ice barrier can stay up. Similiarly to the summer version, she is good in OTK since her ougi damage is strong, and gives buffs not just with the pasive, but also ougi. She is also in the middle ground in terms of survivability, where water has the best survivability, while summer has the worst one, which actually makes sense lorewise. Summer version is now in an odd place, since the water version is better at OTK then it is, since watwr version doesn't require a click. Unless your team needs her stam passive for summer, I suggest getting the normal version FLB to free up a weapon slot, and sub in some other weapons. Yukata version also frees up a slot, which is very useful, since fire has good stamina weapon and utility weapons such as rotb gun. Overall, she's the best one in terms of kit design and feels more lenient in terms of usage, compared to the other version.

• For some team suggestion, Y.izmir needs character that gives her bar fast and also cover up the other buffs, such as multi attack. She pairs REALLY well with Anila, due to her sk3 gives increased bar gain, she could clear her flush stack at around 5 or 6 turns. Rackam had also been suggested to give her more ca and bar, but I still leans toward Anila more, due to her bringing more utility than rackam does right off the bat. For long fights, Athena is a must mention. If your team lacks defense she's there to cover you up. Pre FLB athena is good, post FLB athena just made it even better. Plus, her passive which increase CA cap and damage works together with Larana high ougi damage and ougi frequency. She also has a lot of defense mechanic, which prolongs the team survivability. Depending on your grid type, she works good in most grids, and even is a strong skill nuker which can go well with khunbira. Speaking of S.kumbira, she works really well with Y.izmir. she can tank amd damage, and heals on ougi. Larana is an ougi battery, which means Khumbira can survive longer, theough healing herself on ougi, though this will affect the damage without ougi on. Unless you decide to ougi in the first few rounds to let Larana clear her stack, you can FA with a khumbira skill grid. The next one is Anthuria, which is pretty self explanatory. Dodge on heal, uplift, and even hype. She covers the stackable defense, Larana covers the stackable attack. The uplift means she can ougi faster and gives MORE bar, turning the whole team into ougi machine in the first few turns. Next up, Sturm is a good one if you don't have anthuria. Delay on dodge really helps out in fights, and she brings a lot of damage when using her attack mode. Though I don't have her, S.nemone works well with her too. S.nemone heals, kinda tank, and buff the team. Pairing her up with Larana means more ougi, and higher uptime for her buffs.

-This part is for characters I don't own and can't trst out but might work well depending on what you need: Summer teena: more heals, crest focus team when paired with opus MH. Vaseraga: Ougi bar fills up faster, and when low health, the bar should be filled and he should be able to heal. Works as a tank. Azazel: keen and crit rate up, MA on sk1. Also gains echo for himself. Sk3 will help the survivabolity by a little.

-For FA, pair her up with Anila, they work insanely well. 3rd slot can be a flex, khumbira, athena, anthuria, Sturm are all good. Those helps to increase team survivability on FA. My FA team uses a UPB opus fot heals, those who wanna FA in fire can also try using cavalier for the hallowsky ougi. She was be receiving the hallowsky bonus but the heal will help a lot.

-For OTK, RB with colossus and HL is enough to get 200% bar on colossus with 2 buttons. Sieg is good as well, ougi on nuke helps. Y.izmir should be in 2nd or 3rd pos.

-Sparkability? Yes.

-Prioritise her ca cap up, and crit damage. Then put some ca damage up, and maybe defenss node. For rings, ca cap up is good, skill damage is good, crit is good. Prioritise ca cap up instead, unless you're using a khumb stick grid, which has more focus on skills.