History Characters / GrandmasterOfDemonicCultivationMoDaoZuShiLanClanOfGusu

The current head of the Lan Clan, and known for his warm and refined personality, as well as his sincere and gentle nature. He is Lan Wangji's older brother; together, they are known as the Twin Jades of Lan, especially since [[StrongFamilyResemblance they are very similar in appearance]]. He swore an [[BloodBrothers oath of brotherhood]] with Nie Mingjue and Jin Guangyao, and he is the middle brother. Together, they are called the Venerated Triad.

* PeekABangs: Downplayed. In his character designs from most adaptations, his side bangs often cover part of his left eye.

* {{Keigo}}: Befitting a young man with good manners, Lan Sizhui usually speaks in a formal and polite manner. In the Japanese dubs this is retained by having him using formal Japanese speech patterns.

* HundredPercentAdorationRating: He leads the Lan Clan and everyone likes and respects him, even the antagonists. [[spoiler:For all the atrocities that [[BigBad Jin Guangyao]] has done, he's never once thought about betraying Lan Xichen.]]

* ReasonableAuthorityFigure: He's patient and diplomatic to everyone, which is what earned him his HundredPercentAdorationRating. Even when he has partialities about certain issues, he'll still try to keep an open ear and mind. However, he's also a deconstruction of the trope since while he's congenial towards anyone he meets, it doesn't mean he always knows what to do nor does he always take the proper course of action in dire situations.

* FreudianExcuse: It's heavily implied that his parents' history -- which details how [[spoiler:his father was torn between defending his love and his clan]] -- influenced Lan Xichen's aversion of starting any conflict or picking a side, even if doing so is the right thing to do.

* ParentsAsPeople: Lan Qiren was the one who raised his nephews and is one of the few parental figures that isn't abusive. He sucessfully made them talented and well-mannered cultivators, and Lan Xichen and Lan Wangji in return always show their respect to him. However, the expectations Lan Qiren placed on his nephews when growing up left them repressed and unable to let loose once in a while, which negatively affects them in the long run. [[spoiler:Lan Wangji gets better from this issue thanks to Wei Wuxian's influence, but Lan Xichen doesn't as he was never prepared for the possibility of experiencing severe mental trauma]]. While Lan Qiren isn't unsympathetic to their predicaments, he tends to worry more about how his nephews are no longer the "perfect children" in his eyes.

* HasTwoMommies: A gender inversion. Lan Wangji raised him and Wei Wuxian [[spoiler:(who previously took care of him) also becomes a father figure following their marriage, making them his parents in all but name]].

* {{Keigo}}: Befitting of a young man with good manners, Lan Sizhui usually speaks in a formal and polite manner. In the Japanese dubs this is retained by having him using formal Japanese speech patterns.

* NiceGuy: He's gentle and mannerly to everyone, a trait which impresses Wei Wuxian since he initially thinks every Lan cultivator is stuffy and strict.

* TheReliableOne: Wei Wuxian considers Lan Sizhui the most reliable out of the juniors due to his maturity, composure, kindness, and open mind.

** Lan Qiren is strict on himself and on others about following the rules of his clan... so as long as it works in their favor. For example, as far as the majority of the Lan Clan knew, [[spoiler:Madam Lan never left her house because she suffered an illness, which isn't the case]]. However, Lan Qiren didn't do anything to clarify the matter even though their clan forbids dishonesty, since the truth was much more politically scandalous.

* KarmaHoudini: Downplayed. He was one of the participants of the First Siege, an event that saw the deaths of both [[spoiler:the Wen survivors]] and Wei Wuxian (a man he still demonises in the present). However, like everyone else, he doesn't get any legal nor karmic punishment for it (putting aside Wei Wuxian's constant presence annoying him once again in the epilogue after [[spoiler:he marries Lan Wangji and starts living the Cloud Recesses]]).

* SadistTeacher: Downplayed. While his strict teachings aren't unfair and has its benefits, Lan Qiren wasn't above targeting Wei Wuxian when he briefly taught him, even when the latter was fulfilling his student duties or if other students were involved in the issue.
* SkewedPriorities: While he genuinely loves his nephews, he's also borderline obsessed with making sure that they continue to meet his standards for an upstanding disciple. This tends to take precedence over more pressing matters, making him oblivious at best and indifferent at worst to his nephews' personal struggles. In the climactic arc, [[spoiler:even when Guanyin Temple is a mess and the two men have emotional events to deal with]], all Lan Qiren laments is that his once perfect two newphews are no longer listening to him.

!!!'''Voiced by (Mandarin):''' Jin Xian (animation), Wang Kai (audio drama - adult), Yan Meme (audio drama - child), Ling Fei (web series)\\
'''Voiced by (Japanese):''' Creator/ToshiyukiMorikawa (animation, audio drama, web series)\\
'''Voiced by (Korean):''' Kim Yeong-sun (animation)\\
'''Played by:''' Liu Haikuan (web series - adult), Shen Yifeng (web series - child)

->''"We only believe in what another person says based on how much we know about them. [...] You believe in your judgement, then am I not allowed to believe in my judgement?"''

!!!'''Voiced by (Mandarin):''' Liu Cong (animation), Song Ming [[note]]credited as Baomu Zhongyang[[/note]] (audio drama), Zhang Wentian (web series)\\
'''Voiced by (Japanese):''' Mitsuhiro Sakamaki (animation, web series), Creator/TarusukeShingaki (audio drama)\\
'''Voiced by (Korean):''' Lee Chang-min (animation)\\
'''Played by:''' Huang Ziteng (web series)

!!! '''Voiced by (Mandarin):''' Chenzhang Taikang (animation - teenager), Xian Piao (animation - child), Qian Wenqing (audio drama - teenager), Yu Shuhan (audio drama - child), Chen Jinwen (web series)\\
'''Voiced by (Japanese):''' Creator/ShimbaTsuchiya (animation, web series), Creator/YuusukeKobayashi (audio drama)\\
'''Voiced by (Korean):''' Nam Do-hyung (animation)\\
'''Played by:''' Zheng Fanxing (web series - teenager), Jiang Yiting (web series - child)

->''"It is as though if either Senior Mo or Hanguang-jun are present, I will not need to be scared or worry about anything.''"

* OlderThanHeLooks: He may not look like it, but Lan Sizhui is actually a few years older than Jin Ling even though they're the same height and look youthful enough to be of the same age. Creator/MoXiangTongXiu revealed that his height is stunted due to suffering from malnutrition during his childhood.

!!! '''Voiced by (Mandarin):''' Wang Chenguang (animation), Cao Xupeng [[note]]credited as Xiahou Luofeng[[/note]] (audio drama), Liu Kang[[note]]credited as Liu Sicen[[/note]] (web series)\\
'''Voiced by (Japanese):''' Creator/SomaSaito (animation, web series), Creator/HiroShimono (audio drama)\\
'''Voiced by (Korean):''' Jeong Joo-won (animation)\\
'''Played by:''' Guo Cheng (web series)

->''"I would rather be eaten by a monster on a night-hunt than starve to death here!''"

* HeroWorshipper: He highly respects Lan Wangji and frequently brags about his talents and feats. He even gets upset when he mistakenly thinks that Wei Wuxian doesn't have the same opinion.
-->'''Lan Jingyi''': Of course Hanguang-jun is good. He just never likes to show it off. He is very low-key, right?\\
'''Wei Wuxian''': ''[confused]'' Are you asking me? Why are you asking me?\\
'''Lan Jingyi''': ''[angered]'' So you think that Hanguang-jun is not good?!

-->'''Wei Wuxian:''' Hanguang-jun, it's up to you now. We're gonna go ahead!\\
'''Lan Jingyi:''' That was it? You're not going to say anything else?\\
'''Wei Wuxian:''' What else do you want me to do? What else should I say?\\
'''Lan Jingyi:''' Why didn't you two say, "I'm worried about you. I'm staying!", "Go!", "No! I'm not going! If I'm going, you're going with me!"? Isn't it a must?

!!! '''Voiced by (Mandarin)''': Yue Yeqiao (audio drama)

* PosthumousCharacter: She was already dead prior to the beginning of the story.

!!!'''Voiced by''': Lu Gengyi (web series)\\
'''Played by''': Lee Yeuk-Tung [[note]]credited as Carman Lee[[/note]] (web series)