I checked in the get apps and didn't find a comic book reader, so i searched and found these:
https://portableapps.com/node/15757
https://portableapps.com/node/9723
https://portableapps.com/node/9252
https://portableapps.com/node/31094
and a lot of references to Sumatra.
On Gizmo's i found references to STDU Viewer that i will try and has a portable version. Maybe STDU could be added to the apps?
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Sumatra PDF Portable is already in our directory and supports both CBZ and CBR comic book formats in addition to PDF, eBook (ePub, Mobi), XPS, DjVu, and CHM.
https://portableapps.com/apps/office/sumatra_pdf_portable
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