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Xenon is a main character in Cytus II, and is one of the 25 playable characters. Currently, Xenon has 17 songs, and maxes out at Lv. 50.


Simon Jackson, aka. Xenon, is a system security administrator who works at A.R.C.; he has access to lower levels of the system. A highly skilled programmer, he is also the leader and primary guitarist of the personal band "Xenon".

The former guitarist of Crystal PuNK, he left the band after blaming himself for the tragedies that befell his sister and father. An extremely proficient hacker; when he was younger, he acted under the legendary alias "X".

After seeing all the victims impacted by the effects of AEsir Fest, he sets out to uncover the truth of what transpired.


Main article: Xenon OS Logs
Further information about Xenon: Crystal PuNK OS Logs

Xenon has a sense of needing to protect other people and ending criminal activity, as he does work as a security administrator regularly. He has a strong sense of justice, despite being stern and sometimes harsh on his friends and colleagues, being a "no-nonsense" type of person. People seem to find him slightly awkward because of this. Even so, he sometimes softens and acts more laid-back when situations don't seem quite dire, and makes sure to express his care towards others when needed.

Though working towards bringing fairness and justice to the world, his methods aren't always the best or most legal, such as his hacking, which he mostly uses to gain information through unjust means with a coverup identity. This results in him getting wrapped up into situations where he'll often take the blame for someone else's fault only because he wasn't setting a good example to the public. However, Xenon has no desire to stop these acts, and is actually quite stubborn when it comes to either changing methods or receiving help from people he knows in order to slip away safely, wishing for neither of those things.


Xenon Songs
Player Song Artist Easy Hard Chaos Glitch BPM Length Release DLC
INSPION INSPION 4 9 13 148 2:38 1.0
YouTube Whispers in my Head AssHoleBand 2 7 13 175-180 2:42 1.0
YouTube Return L DERCoLoR 3 6 11 205 2:24 1.0
Fighting Claymore 2 7 11 170 2:47 1.0
YouTube To the Light FUTURE AFTER A SECOND 4 8 12 14 130 2:51 1.0
YouTube Phantom Razor Daisuke Kurosawa 4 8 13 14 183 1:50 1.0
YouTube Black Hole A-Tse & KIVΛ 2 4 10 135 3:11 1.0
YouTube Samurai Kobayashi Project 4 9 13 160 2:41 1.0
YouTube IOLITE-SUNSTONE Hideyuki Ono x Daisuke Kurosawa 3 7 11 164 1:59 1.0
Ultimate feat. 放課後のあいつ やいり 3 8 13 190 3:10 1.6
YouTube Karma OBSESS 3 7 11 138 3:01 2.4
YouTube Sairai Shinichi Kobayashi 2 5 10 95 1:59 1.1
YouTube Chosen 既定印象 4 7 13 170 2:56 2.6
YouTube Asylum Zangief 3 7 12 160 2:45 2.7
Violet Yohei Kimura 2 7 14 190 2:53 2.7
YouTube concentric circles Yichen 4 7 12 13 190 2:57 1.0
YouTube Tiny Giant Goes To The Sea Kyo-ta 5 8 12 100 3:02 5.0.0

Result Screen Quotes

"I can't stand this anymore." "Forget about it." "Yes, I quite like it." "Well-Played "You came really close. You'll get it next time. I guarantee it." "These skills... I accept defeat."
"This is not for you." "You need to start from the basics. Understand?" "Not bad." "The music is fantastic." "Mind if I take a look at your tone settings? That sound was incredible." "A perfect score... for real? You are truly awesome."
"...." "You did not practice at all..." "Pretty good. However, this is not your best, is it?" "Great work. Looking forward to an opportunity to JAM with you someday." "A machine may be better than JOE, but it's still no match for you." "I'm considering giving you the optic guitar... You deserve it more than me."


  • The theme of Xenon was arranged by KIVΛ & Yichen Personal Studio.
  • The color of Xenon's Logo, Burnt Umber, is a naturally occurring pigment produced from the oxidation of iron by various chemicals, including the halogen Xenon.
  • Xenon is a chemical element that goes by Xe and is element #54 on the periodic table. One of its main uses is for radiation detection, which could possibly tie to his name and his occupation.
  • Xenon is the first playable character with a song that first appeared in Deemo, Sairai.
  • The reasoning for how Xenon can play Sairai is elaborated on in Alice’s story.
  • He, along with Ivy and Vanessa, are the only characters with hidden songs.
  • His guitar's name is Crimson Duke.