In the event of an emergency, or an exclusion for some reason, there is a clear line of succession in who is to be Mai Waifu. This is: The Waifu Hierarchy.
1. [url=http://www.hdwallpapersdesktop.com/1280x800/images/7586-spice-and-wolf-holo.jpg]Holo[/url] (Spice and Wolf)
2. [url=http://media-cache-ak0.pinimg.com/736x/d4/5b/10/d45b10bf8a42cb79580c50c75c1dc485.jpg]C.C.[/url] (Code Geass)
3. [url=http://media.animevice.com/uploads/2/25664/469928-ep19__10_.jpg]Kallen Kozuki[/url] (Code Geass)
4. [url=http://cdn.myanimelist.net/images/characters/14/164195.jpg]Ayano Kosaka[/url] (Code Geass: Akito)
5. [url=http://3.bp.blogspot.com/-HGg2XVsSXkw/U_VcVaksbhI/AAAAAAAGb6E/gabedThuNXA/s1600/10448630_10204787526751600_8150199208949540158_o.jpg]Leila Breisgeau[/url] (Code Geass: Akito)
6. [url=http://media.animevice.com/uploads/2/20763/390251-bleach_yoruichi113.jpg]Yoruichi Shihoin[/url] (Bleach)
7. [url=https://40.media.tumblr.com/7d4607f792db40cb1097a7cc585e3285/tumblr_nraoymPyis1uq0fwuo1_500.png]Pina Co Lada[/url] (Gate)
8. [url=http://www.skgcl.com/news/wp-content/uploads/2016/03/54661_gate_rory_mercury.jpg]Rory Mercury[/url] (Gate)
9. [url=http://www.animemb.com/wp-content/uploads/wallpapers/lunamaria-hawke-wallpaper.jpg]Lunamaria Hawke[/url] (Gundam Seed)
10. [url=http://myanimeshelf.com/upload/dynamic/2012-05/07/Sumeragi_0082.jpg]Sumeragi Lee Noriega[/url] (Gundam 00)
11. [url=http://images5.fanpop.com/image/photos/25000000/Euphie-suzaku-and-euphemia-25066386-455-640.jpg]Euphemia Li Britannia[/url] (Code Geass)
12. [url=http://images4.wikia.nocookie.net/__cb20120517002110/gundam/images/1/16/Liu_mei.png]Wang Liu Mei[/url] (Gundam 00)
13. [url=http://img2.wikia.nocookie.net/__cb20130927042008/lotton/images/8/8f/163041.jpg]Marlene Angel[/url] (Blue Gender)
14. [url=http://kawaii-mobile.com/wp-content/uploads/2013/07/Maoyuu-Maou-Yuusha.Mao-Demon-King-iPhone-4-wallpaper.640x960.jpg]Mao[/url] (Maoyuu Maou Yuusha)
15. [url=http://media.animevice.com/uploads/0/4/4189-motoko5.jpg]Motoko Kusanagi[/url] (Ghost in the Shell)
16. [url=http://2.bp.blogspot.com/-kHRT-R7KXhU/U8jfAGLSbfI/AAAAAAAAAMM/N-4H-lYk-aw/s1600/misato.jpg]Misato Katsuragi[/url] (Evangelion)
17. [url=https://janniceg.files.wordpress.com/2010/05/rei-ayanami-flematica.jpg]Rei Ayanami[/url] (Evangelion)
18. [url=http://bloggfiler.no/afgpics.blogg.no/images/795617-4-1273445207034.jpg]Cecile Croomy[/url] (Code Geass)
19. [url=https://mayafreaksblog.files.wordpress.com/2010/01/cagalli-06.jpg?w=593]Cagalli Yula Atha[/url] (Gundam Seed)
20. [url=http://s1.tsuki-board.net/pics/figure/large/410723.jpg]Tuka Luna Marceau[/url] (Gate)
21. [url=http://i1.ytimg.com/vi/yjPFZxSXnng/maxresdefault.jpg]Blair[/url] (Soul Eater)
22. [url=https://ghostlightning.files.wordpress.com/2009/02/cowboy_bebop_anime.jpg]Faye Valentine[/url] (Cowboy Bebop)
23. [url=http://images2.fanpop.com/image/photos/9000000/Rukia-rukia-kuchiki-9090496-1024-768.jpg]Rukia Kuchiki[/url] (Bleach)
24. [url=http://ip1.anime-pictures.net/jvwall_images/3de/3deb30c341016141f597b47ce0e2b6d4_bp.jpg]Lacus Clyne[/url] (Gundam Seed)
25. [url=http://img04.deviantart.net/bfa8/i/2009/103/8/f/gundam_00___feldt_grace_by_kujiki.jpg]Feldt Grace[/url] (Gundam 00)
26. [url=http://2.bp.blogspot.com/-cXYdtSz6TZU/UD43MjCIgII/AAAAAAAAF-w/RnFoiG1N-B4/s640/Yugiri+Perserte.jpg]Perserte Yugiri[/url] (Polyphonica)
27. [url=http://images4.fanpop.com/image/photos/18100000/Kyou-Fujibayashi-fujibayashi-kyou-18145479-1023-703.jpg]Kyou Fujibayashi[/url] (Clannad)
28. [url=http://images5.fanpop.com/image/photos/25500000/Iwasawa-masami-iwasawa-25513311-1024-576.png]Masami Iwasawa[/url] (Angel Beats)
29. [url=http://images6.fanpop.com/image/photos/35100000/Yuri-Nakamura-3-angel-beats-35185473-1920-1200.jpg]Yuri Nakamura[/url] (Angel Beats)
30. [url=http://moe.animecharactersdatabase.com/images/TenchiMuyo/Washu_Hakubi_San.png]Washu Hakubi[/url] (Tenchi Muyo)
31. [url=http://media.animevice.com/uploads/0/72/73894-saya_otonashi_1600x1200_2.jpg]Saya Otonashi[/url] (Blood +)
32. [url=http://i1.wp.com/www.cartoonleap.com/wp-content/uploads/2015/09/Gate-12104.jpg]Yao Ha Ducy[/url] (Gate)
33. [url=http://3.bp.blogspot.com/-5k_NoiF5WgI/UHA-E6NFWjI/AAAAAAAARNo/JIFpklWK3SA/s1600/Talho_Yuki_Anime_Wallpaper%2BEureka.jpg]Talho Yuki[/url] (Eureka 7)
34. [url=http://images4.fanpop.com/image/photos/17900000/Inoue-Orihime-1orihime-inoue-fan-club-17926137-1280-720.jpg]Orihime Inoue[/url] (Bleach)
35. [url=http://images4.wikia.nocookie.net/__cb20120807234731/fma/images/3/32/Winry.png]Winry Rockbell[/url] (Fullmetal Alchemist)
36. [url=http://wallpoper.com/images/00/36/87/16/inuyasha-sango_00368716.jpg]Sango[/url] (InuYasha)
37. [url=http://images6.fanpop.com/image/photos/38100000/Leone-wallpaper-akame-ga-kill-38197643-1280-720.png]Leone[/url] (Akame ga Kill)
38. [url=http://3.bp.blogspot.com/-Q418_s_YZvQ/U0aT9pL_C_I/AAAAAAAAIKU/2M7X0jYSI80/s1921/erza-scarlet-anime-girl-damnedmetal-1600x900.jpg]Erza Scarlet[/url] (Fairy Tail)
39. [url=http://images4.fanpop.com/image/photos/18700000/Kagome-kagome-higurashi-18797439-1600-1200.jpg]Kagome Higurashi[/url] (InuYasha)
40. [url=https://2nitaku.files.wordpress.com/2013/11/asuka_langley_soryu_render_by_dani_scorp.png]Asuka Langley Soryu[/url] (Evangelion)
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Leaving this here