I had a hard time deciding on destined Mobile Suits, so im gonna do my best on why i choose them these mobile suits.
Hakurei Shrine:
Reimu Hakurei- She and RX-78-2 are the first so it makes sense. Then she will change to the NT-1 because she had a spell card in UFO that was like firing a minigun
Suika Ibuki- both look like there strong, i originally wanted her to pilot the Bolt Gundam but decided that should be Yugi's.
Mima- While Marisa has Wing Gundam and Yuka has Wing Zero, Mima fits to have to Wing Zero Custom. Because all three have Master Sparks that are similar to the Buster Rifles, so: Buster Rifle=Master Spark Twin Buster Rifle=Dual Spark Wing Zero Custom Buster Rifle=Twilight Spark!
Forest of Magic:
Marisa Kirisame- The Double Zeta has the same weapons just like Marisa. Missiles, Transforming to move faster, and a Giant Laser. Then she will be piloting the Wing Gundam which might have a better laser than the Double Zeta. I orginally had Marisa to pilot the Hyaku Shiki or The Zeta Gundam, but Double Zeta was more suitable.
Alice Margatroid- Her Dolls fit to be Funnels which suits her to pilot the Qubeley, then she will switch to the Nu Gundam which is has a better Funnel System
Team 9: "the cannon fodder MS"
Cirno- Both her & the Ball are Teh Stongeest & WEAK!
Daiyousei- Since she not so stupid as Cirno, she looks to fit the Zaku II
Rumia- Heat your right, she should pilot the Zakrello never thought about it. i had thoughts of Rumia piloting the Geara Doga but decide on the Gaza-D to represent the Gundam ZZ cannon fodder.
Wriggle Nightbug- to fit in with the Zaku family with Hi-Zack, now for her to pilot the Zeta Gundam i once saw a picture on Pixiv that had Wriggle looking excatly like Kamille.
Mystia Lorelei- When i heard about a Pink Zaku in SEED Destiny, i thought why not both characters like to sing right?
Seasons:
Letty Whiterock- I went to think of a MS from the snow, then i started remembering Bertigo from Gundam X.
Lily White- "Spring is Here!*Fires a barrage of Bullets*" thats why she has heavyarms, or maybe the Airmaster to tie in with the Leoplard
Lily Black- Same above, but to fit her colors, the Leopard for Gundam X
Aki Sisters- I thought about them being the Frost Brothers and decided, why not. I once had an imagination of the Aki Sisters having a fight with Letty and her Beritigo
Scarlet Devil Mansion:
Hong Meiling- Now for Meiling, there 3 mobile suits that suit her, Shenlong & Altron plus Dragon Gundam were all Chinese themed Mobile Suits, and the Shining & God Gundam also being a fighter type gundam which is what Hong is mostly good at. So one of those 3 mobiles pretty much fit her, but which ones better?
Koakuma- had a hard time deciding on her mobile suit, so thought of a Mobile suit that had wings, so i decided Re-GZ should be hers.
Patchouli Knowledge- For Patchy, its was also a hard choice to find a Mobile Suit for her or a character that matches her personality, in the end i decided to go with The O.
Sakuya Izayoi- Went to look for a Mobile Suit that uses Knifes, only the Strike Gundam has it but doesnt use a lot. So i decided that the Spiegel/Shadow Gundam would fit her.
Remilia Scarlet- to go with the Red, she definitly goes well piloting Mobile Suits from the Red Comet, i made the first Gundam to her alternatives because i cant find Mobile Suit that uses a Spear
Flandre Scarlet- Both her & the Epyon wield mean swords.
Hakugyokurou:
Chen - The Leo & the Tallgeese seem to be related to each other
Prismriver Sisters- The only Trio i know in Touhou who definitly fit to be "The Black Tri-Stars".
Lunasa: Merlin! Lyrica! Time to launch a Jet-Stream Attack on that Mobile Suit!
Youmu Konpaku- Tried to look for a Mobile Suit that has 2 swords, The Sandrock was close enough.
Yuyuko Saigyouji- Both her and the Turn-A had a Butterfly Motif
Ran Yakumo- See Chen.
Yukari Yakumo- Went to search for the Strongest Mobile Suit, Tallgeese III was my result. I decided the Yakumos will pilot the Tallgeese series
Eientei: Most of these characters could of Piloted the G Gundam Gundams but only few have them, but i decided on the Turn-A Mobile Suits.
Keine Kamishirasawa- To go with the whole transforming into a monster being the same with the Berserker System, or Tie-in with the Turn-A MS with the FLAT
Tewi Inaba- Kapool was my only decision.
Reisen Udongein Inaba- Originally gonna be the Maxter Gundam to tie-in with the Pistols, but Maxter is more on doing Fist attacks so i decided the SUMO will do to tie-in with being the bodyguard.
Eirin Yagokoro- both her and the Rising Gundam use a Bow & Arrow so it fits, or pilot the GX to go with the whole moon thing.
Kaguya Houraisan- Turn-X was on the Moon and to rival Mokou's mobile suit as both have Shining Fingers.
Mokou No Fujiwara- Tried to find a Mobile Suit that has flames but no of them have em. So I decided, in order to rival Kaguya's Mobule Suit give her the Shining Gundam or the God Gundam. Mokou could of used the Turn-A to rival Kaguya's Turn-X but decided that Yuyuko should have it.
POFV:
Medicine Melancholy- The GP Gundams were based on Flowers i decided on the GP01 for her, i tried to look for a Mobile Suit that uses Poisens & Acid; the Skull Gundam being to only one to have a poison attack.
Yuka Kazami- Also Flower themed so GP03S, but since has the Dual Spark she will be deadly with the Wing Zero!
Komachi Onozuka- Do i need an explanation on the Deathscythe & her?
Sikieiki Yamaxanadu- Dont know any Judges in Gundam, that sign she holds makes it look like a sword, either Rose Gundam to be part of the Flower themes or Sazabi.
Youkai Mountains:
Hina Kagiyama- Also uses Dolls so she deserves the Qubeley, unless theres a Mobile Suit that spins
Nitori Kawashiro- Was originally going to pilot the Ez8 Gundam, but i saw a
picture of her wielding the F91's VSBR
Momizi Inubashiri-
Both have Sword & Sheild
Aya Syameimaru- Both her & the Hyaku Shiki are the fastest, or pilot the Zeta Gundam when in WaveRider form to be fast
Sanae Kotiya- Since shes another shrine maidern she could go well with the Gundam Mk.II to tie-in with Reimu's Gundam
Kanako Yasaka- Besides the GunCannon Joke, she could be suitable for the Double X or the God Gundam
Suwako Moriya- To tie-in with Kanako being the GunCannon, Suwako should be the GunTank. Or Pilot the Big Zam because it looks frog looking i guess.
Nirvana:
Iku Nagae- The Gouf is the only Mobile Suit i know that has an Electric attack
Tenshi Hinanai- I gave her the Double Zeta mainly because of the Laser Blast she has or the Rick Dom because the Heat Rod & her sword look the same.
Ancient City & Palace of the Earth Spirits: Made up of a few Titan Mobiles Suits
Kisume- The Asshimar armor mode looked close to looking like a bucket
Yamame Kurodani- Tried to look for a spider themed Mobile Suit and found nothing, decided the Baund Doc looks close enough.
Parsee Mizuhashi- Went to look for a character in Gundam that had the same personality has Parsee so i examined Sarah Zabiarov and it kinda matches so, go with the Hambrabi.
Yuugi Hoshiguma- Went look for a Mobile Suit with Brute Strength, the Bolt Gundam being close to it.
Satori Komeji- Had a hard time with her mobile suit, and finding a Gundam Character that Matches Satori, so i decided on the Palace Athene
Rin Kaenbyou- Had a hardtime with her mobile suit, so i decided to tie-in with Utsuho's Mobile Suit with the GP01-Fb
Utsuho Reiuji-
Both are Nuclear! I just had the thought of her piloting any of the Wing Gundams, but then again NUCLEAR POWER!
Utsuho: Gensokyo! I have returned! *Nukes Gensokyo*
Koishi Komeji- Also had a hard time so i decided that since shes stronger than her sister, maybe the Quin Mantha would be suitable
Palanquin Ship:
Nazrin- Couldnt find a good mobile suit for her, so i decided maybe she could use the Acguy
Kogasa Tatara- Can some give her a good Mobile Suit please?
Ichirin Kumoi- Suitable for Gundam Maxter because of her partner's FIST!
Captain Murasa- Jamil Neate returns to piloting Mobile suits. Note: Sorry if i spoiled it, tried to looked for the option to hide spoilers.
Shou Toramaru- Looks suitable to pilot the Dragon Gundam.
Byakuren Hijiri- Also looks suitable to pilot the Master Gundam.
Nue Houjuu- The Zeong looks a bit similar to a UFO from under, so i thought maybe Nue could use this.
So those are notes on why i picked there Mobile Suit, and i had hard time deciding on the them. I also had a hard time on which Victory Gundam mobiles suits on who should piloted by who. So feel free to a make your own list on who should pilot which.