 If you liked
Toaru Majutsu no Index Gaiden: Toaru Kagaku no Accelerator
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 ...then you might like
Shingeki no Kyojin: Kuinaki Sentaku
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Spinoffs with new storylines that focus on a disagreeable, verbally abrasive badass from their respective parent series getting dragged into chaotic events. A fan of Levi, humanity's strongest from Shingeki no Kyojin, would want to read Kuinaki Sentaku. A fan of Accelerator, Academy City's strongest from the Raildex series, would want to read Toaru Kagaku no Accelerator. And a fan of Levi could very well also be a fan of Accelerator, and vice versa.