25 non-closed Wikimedia wikis have main pages whose content is merely a MediaWiki #REDIRECT.

(For the records, those mainpage page names are in sync with the mainpage value defined in MediaWiki Core's ./languages/i18n/qqx.json.)

Instead of a MediaWiki #REDIRECT as main page content, it would be better to edit/create the page MediaWiki:Mainpage and define the custom page name of the main page.
Example: If the page content is #REDIRECT [[Real Main PageName]], then the content of the page MediaWiki:Mainpage should be Real Main PageName

Readers will save a few milliseconds by one redirect less (you can check via curl -Ls -o /dev/null -w %{url_effective}).
It will also remove that unneeded/confusing subtitle line "Redirect from..." when visiting the main page.

• Ôn Keue : https://ace.wikipedia.org/wiki/Ôn_Keue : #PUPINAH [[Ôn_Keuë]]
• Hēafodtramet : https://ang.wikipedia.org/wiki/Hēafodtramet : #REDIRECT [[Heafodtramet]]
• Nayriri Uñstawi : https://ay.wiktionary.org/wiki/Nayriri_Uñstawi : #REDIRECT[[Portada]]
• Баш бит : https://ba.wikibooks.org/wiki/Баш_бит : #перенаправление [[Викидәреслек:Баш бит]]
• El primero pagina : https://cbk-zam.wikipedia.org/wiki/El_primero_pagina : #REDIRECT [[El Primero Pagina]]
• ᎤᎵᎮᎵᏍᏗ : https://chr.wiktionary.org/wiki/ᎤᎵᎮᎵᏍᏗ : #REDIRECT [[Wiktionary:ᎤᎵᎮᎵᏍᏗ]]
• Тĕп страницă : https://cv.wikibooks.org/wiki/Тĕп_страницă : #перенаправление [[Тĕп страница]]
• Тĕп страницă : https://cv.wikipedia.org/wiki/Тĕп_страницă : #REDIRECT [[Тĕп страница]]
• Axa Gba͂tɔ : https://ee.wikipedia.org/wiki/Axa_Gba͂tɔ : #redirect [[Axa do Ŋgɔ]]
• मुखपृष्ठ : https://hi.wikiversity.org/wiki/मुखपृष्ठ : #पुनर्प्रेषित [[विकिविश्वविद्यालय:मुखपृष्ठ]]
• Principal págine : https://ie.wiktionary.org/wiki/Principal_págine : #REDIRECT [[Págine principal]]
• Chefpagino : https://io.wiktionary.org/wiki/Chefpagino : #REDIRECT [[Frontispico]]
• Башкы барак : https://ky.wikibooks.org/wiki/Башкы_барак : #REDIRECT [[Башкы бет]]
• Башкы барак : https://ky.wikiquote.org/wiki/Башкы_барак : #REDIRECT [[Башкы бет]]
• Lonkásá ya libosó : https://ln.wiktionary.org/wiki/Lonkásá_ya_libosó : #REDIRECT [[Lokásá ya libosó]]
• မုက်လိက်တမ် : https://mnw.wiktionary.org/wiki/မုက်လိက်တမ် : #REDIRECT [[ဝိက်ရှေန်နရဳ:မုက်လိက်တမ်]]
• ဗဟိုစာမျက်နှာ : https://my.wiktionary.org/wiki/ဗဟိုစာမျက်နှာ : #REDIRECT [[ဝစ်ရှင်နရီ:ဗဟိုစာမျက်နှာ]]
• Yacatlahcuilolli : https://nah.wiktionary.org/wiki/Yacatlahcuilolli : #REDIRECCIÓN [[Pewalistli]]
• Olayama : https://nia.wikipedia.org/wiki/Olayama : #REDIRECT [[Wikipedia:Olayama]]
• Forside : https://no.wikiquote.org/wiki/Forside : #REDIRECT [[Hovedside]]
• Intangiriro : https://rw.wiktionary.org/wiki/Intangiriro : #REDIRECT [[Main Page]]
• Leqephe la pele : https://st.wiktionary.org/wiki/Leqephe_la_pele : #redirect [[Main Page]]
• Саҳифаи аслӣ : https://tg.wiktionary.org/wiki/Саҳифаи_аслӣ : #REDIRECT [[Саҳифаи_Аслӣ]]
• หน้าหลัก : https://th.wiktionary.org/wiki/หน้าหลัก : #เปลี่ยนทาง [[วิกิพจนานุกรม:หน้าหลัก]]
• Xët wu njëkk : https://wo.wiktionary.org/wiki/Xët_wu_njëkk : #REDIRECTION [[Xëtu Njëlbéen]]