Nintendo announced back in January it was shutting down Miitomo on May 9th. I know, it wasn't very popular, and it's not really a "game", but I figure Nintendo's first smartphone app is worth some sort of archiving effort.
The majority of customization assets (clothes/wallpapers/flooring/etc.) are stored on Nintendo's servers and are downloaded to the app as needed. So once the app shuts down, all of that will probably disappear too.
I used a packet capturer to try and sniff out where the data is coming from. The model assets seem to come from zip files stored on "download-cdn.miitomo.com". ("api.miitomo.com" is another URL where... stuff comes from.) Here's some samples:
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyAcce_output_bodyAcce0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyAll_output_bodyAll0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyBottomsA_output_bodyBottomsA0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyBottomsB_output_bodyBottomsB0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyShoes_output_bodyShoes0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyTops_output_bodyTops0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_bodyTopslong_output_bodyTopslong0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_headwear_output_headwear0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_room_roomFloor_output_rmFl0000.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_room_roomWall_output_rmWl0000.zip
(Replace the "android" with "ios" for the iOS assets.)
I've tried manually downloading stuff by going through the numbers but, um... there's a lot. The shirt numbers alone go up to at least 1000. But a lot of those numbers just don't exist? For example, "headwear0066" through "headwear0099" don't seem to work... but "headwear0100" does... but other numbers going up from there don't... but "headwear0211" does... etc.
It'd be nice to be able to just crawl the whole thing, but I've gotten 403 errors trying that.
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The textures are PVR 3.0, ETC1 encoded (via GerbilSoft). I managed to open them with something called PVRTexTool, but there might be something else out there.
Here's some random examples:
  
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And here's some other random URLs I picked up:
http://download-cdn.miitomo.com/native/20180125111639/manifests/v2_20180405_3_android/manifest.json
http://download-cdn.miitomo.com/native/20180125111639/android/v2/sound.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_archCamera_cameraBg_default.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/20170608va04ga91webp.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_corinthGameBanner2_200820.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_shopBanner2_newStandard124_webp.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/message_Release_Arch_msbp.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/message_Release_Console_JPja_EmotionExpression.zip
http://download-cdn.miitomo.com/native/20180125111639/android/v2/stageimg200500.zip
And one that might particularly be TCRF related:
http://download-cdn.miitomo.com/native/20180125111639/android/v2/unused-assets_csv.zip
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