There is now a new thread for this being maintained by someone else.
JP has a lot of OT weapons that Global at this point will never get at this rate. However, some of these offer good utility... and even moreso, some of them make for incredible looking camos for people's specific outfit. Even JP would like some camo revivals of some OT weapons that don't drop anymore -- I've seen people paying 350m+ for 10* weapons just because they don't drop and they're THAT rare and they fit their entire outfit perfectly.
I intend to make this a community fueled thread. If anyone has any suggestions to make into NT weapons or for camos, feel free to list them and I'll update this. If there is a reasoning, especially for NT weapon requests, listing it could be helpful as well. Listing the type of weapon can help me have an easier time updating the thread as well.
If you wish to remain anonymous when requesting feel free to PM me on the forums instead.
Resources for searching for weapons can be found via the arks-visiphone website (JP version) or the pso2 swiki.
Mar 11: Another small update.
Feb 19: Slow on updating, but finally got around to it.
Dec 18: Thread updated with more requests from the community
Dec 11: To my surprise, Shut Rounder got a camo in the Photon Booster shop. I dunno if this was after they saw this thread or not, but that was an amazing surprise.
Dec 07: Added formatting that I found by accident. Added suggestions from posts, including a lot of TMGs, as well as a couple harmonizers.
OT to NT weapon requests
-- Helen Bathina (エレヌバティナ) Katana - Old Type weapon on JP from PSO2es which is a Katana for all classes. The potential restores 15% of PP when you take damage -- but more importantly, it has built in Morning Mistreaver PA on it, giving all classes access to a good movement PA.
In my opinion, this needs to be a high priority. This is fairly important for a lot of classes for mobility, since some of them just simply don't have good fast movement PAs like Ranger -- especially Ranger/Etoile. Even Etoile as a mainclass often uses it for movement, as well as Gunner, Hunter, Fighter, and probably more that I'm forgetting.
-- Noridonique (ノルリドニーク) Assault Rifle - Has Homing Volley built into the rifle for all classes, which would also be nice to see come over to global, but this is purely for people running time attacks. Definitely not a necessity, because the only time it really sees use is for the speedrunners on Lillipa Time Attack that aren't using Swift Ilgrants to hit the first button in order to get a rank 1 time.
-- Rose Skewer (ローズスキュア) Harmonizer - All class harmonizer that enables using a pet on any class. With EP6 around the corner there should be a new 15* harmonizer that can take it's place, but a more easy access one would be nice for newer players to be able to use Summoner as a subclass while leveling other classes. Also makes for a kind of nice camo (which is apparently now available on JP)
-- Storm Shade (ストームシェード) Rod - Requested by PrinceBrightstar. 11 rarity rod from a Beach Wars event that never got an NT variant. It's an all class rod with Anti, which is very useful if you run out of Sol/Star Atomizers.
-- Klothov M238 (クロトフＭ２３８) TMGs - Requested by Home Rowed. 9 rarity all class TMGs with a potential boosting Meseta gain by 15%. Also has 777 RNG Pwr for probably obvious reasons. Comes with built in Elder Rebellion PA.
-- Edel Io (エーデルイーオー) Bow - Requested by Home Rowed. 9 Rarity bow with a potential boosting EXP Gained by 10%. Also has built in Master Shot PA for all class.
OT to Camo Requests
-- Duel Gaze (デュエルゲイズ) Talis - Requested by AiC-L. There's also a Green and Red colour variant of this talis. Only exists as OT, and has a very, very strange potential which is meant for .... ranger. Side note is that there is a yellow/white/cyan version of this as a camo on JP from the TCG memory exchange called ＊デュエルゲイズＴＣＧ, so this shouldn't be too hard to do since a camo already exists in the files in the first place.
-- Guld Milla (ガルド・ミラ) TMGs - Requested by AIC-L. Iconic PSO weapon which never got an NT version or a camo.
-- Twin Yasminkov 2000H (Ｔヤスミノコフ２０００Ｈ) TMGs - Requested by AiC-L and Vashzaron. Very old weapon, similar existed in PSO and Infinity.
-- H44 Missouri T (H44ミズーリT) TMGs -- OT 10* weapon that have a potential from PSO2es that lowers the recast of Chain Trigger by up to 12.5 seconds based on the Chain Trigger count if used for the first PA of a Chain Finish. While this could be made into NT, I feel like this potential with NT crafting could be a bit too dangerous to safely add... but it also saw use as a camo, so.
-- Cruel series (4 weapons) -- An old 9 star series containing a Gunblade, Twin Daggers, Rod, and Wand. The Gunblade (クルールコフィン) and Twin Daggers (クルエルフローガ) were both requested by IceBlink, but Church10129 noted that we could probably just have a 4 weapon camo that includes the Rod (ヴァイフロース) and the Wand (コルネリア) on top.
-- Hyakka Ryouran (ヒャッカリョウラン) Soaring Blades + Tenimusou (テンイムソウ) Double Saber - A specific request from Church10129 for a camo that can't be colour changed so that the alternate red + blue colour blades exist in their original glory.
-- Steam Series - Requested by Church10129. Similar to the Bio Cellular and Live Cellular camos, this would be a 17 weapon camo. Original weapons: ギアフレイド (Sword), ウィールローレン (Wired Lance), ヴァルヴェット (Partisan), ブラスハウル (Twin Daggers), リフリジオン (Double Saber), スチームナックル (Knuckles), ピュアルサード (Gunblade), ヤテンコウガ (Katana), レイルランダー (Soaring Blades),トランスヴェイン (Assault Rifle), グレンファナル (Launcher), コードシャフト(TMG), フチセフウエン(Bow), トランスシリンダー(Rod), ターンヘッド (Talis), パードウィスラー (Wand), エグザヴェルグ (Jet Boots)
-- Phonlieses (フォンリーゼス) Sword + Rimliese (リムリーゼ) Wired Lance - Requested by LightGamer2016. 11 Rarity OT Sword that dropped off Dark Ragne, with the Wired Lance coming from one of the small bug darkers that that has a stunning spin attack. Both of these were weapons that went with the outfit series クインティリーゼス. The Talis (クインロセウム) could probably be added in this too, but it's a different colour scheme.
-- Anti-Android Rifle (対アンドロイドライフル) - Requested by Ryoga. 10 Rarity weapon from Magatsu that never got NT variant.
-- Egg Blaster (エッグブラスター) TMGs - Requested by Ryoga. 7 Rarity weapon from Egg rappies for Easter seasonal.
-- Red Scorpio (レッドスコルピオ) + Guilty Light (ギルティライト) Launchers -- Requested by Ryoga. Part of a series of 3 launchers that were 11 rarity.
-- L&K14 Combat (Ｌ＆Ｋ１４コンバット) TMGs -- Requested by Ryoga. 10 rarity TMGs that were a reward for completing Ch3-1 of the story.
-- Talis Legacy (タリスレガシー) -- Requested by Ryoga. 8 rarity Talis from certain enemies.
-- Haze Series (Partisan, Sword, RIfle) -- 3 Weapons that all dropped from Haze Drahl. Partisan is ヘイズオディオ, Sword is ヘイズヴァイア, Rifle is ヘイズエヴォル. Requested by Ryoga, with additions by Church10129.
-- Chainsawd (チェインソード ) Sword -- Request by Ryoga. 12 rarity sword that dropped in Ultimate Naverius.
-- Sarce Punisher (サルスパニッシャー) Rifle -- Request by Ryoga.
-- Elysion (エリュシオン) Wand -- Request by Ryoga.
-- Firearm-C (ファイアーアームズ) Rifle - Requested by myself. This is already viewable in Global (Challenge: Strike quest in Challenge Mode) but is not available as a camo or as a weapon that can be used outside of Challenge Mode.
-- Falclaw (ファルクロー) Wired Lance - Requested by a friend of Church10129. 11 rarity OT weapon from Elder.
Unavailable NT Weapon Requests
-- Flame Visit (フレイムビジット-NT) Launcher - Requested by Ryoga. Mostly for camo purposes, originally requested as OT to Camo but it has an NT version from PSO2es.
-- Yasminkov 8000C (ヤスミノコフ8000C) TMGs - Requested by AiC-L. Mostly for camo purposes, but it does have a 13* NT version that does not exist on global because it's only available from PSO2es.
Unavailable Camo Requests
-- Soujyusen (＊奏従扇) -- Requested by coldreactive. Harmonizer camo from 週刊ファミ通 February 2016 in JP.
-- Mercy of Lillipa (＊マーシー・オブ・リリーパ) - Requested by an alliance member. Only a camo and an OT weapon on JP. OT weapon was from an Episode 2 deluxe package (which gave green badges to turn into whatever from the shop), and the camo I think required you to have this OT weapon to get it. This only applies to bow.
-- M&A60 Vice (＊M＆A60ヴァイス) - Requested by Ryoga. TMG camo from a very long time ago, now available in a legacy Weapon Badge shop on JP
-- Motav Codex (＊モタブの写本) - Requested by Ryoga. Talis camo from ages ago, now available in legacy Weapon Badge shop on JP
-- Inga Hyouri (＊インガ・ヒョウリ) - Requested by Ryoga. Twin Dagger camo from ages ago, now available in legacy Weapon Badge shop on JP
-- Chain Belk (＊チェインベルク) - Requested by Ryoga. Sword camo based on the Chainsawd sword but with black and red colouring.
-- Gravis Punisher (＊グラウィスパニッシャー) - Requested by Ryoga. Rifle camo based on the Sarce Punisher weapon with different colouring.
-- Elydorado (＊エリュドラド) - Requested by Ryoga. Wand camo based on the Elysion weapon with different colouring.
-- Magika Fleurir (＊マギカ・フルーリア) -- Requested by Princesse Jen, which is a rod camo.
-- Shut Rounder (シャットラウンダー) Gunblade - Requested by me personally. Now exists in the Photon Booster shop for 10 Photon Boosters.
-- Bullet Kunai (バレットクナイ) TMGs - Now drops in Armada Training: Final Lament -- wasn't aware it dropped here. Also was a ridiculously rare drop in Valentine's seasonal, apparently? Maybe it only dropped in XH Valentine's, no idea.