I'm currently working on a fan project and it'll take about a year to complete but so far, my research into the Bat Family comes at a standstill when it gets to Jason. See, everyone knows he has beef with the Joker but during his short time as Robin, were there any other villains who proved a challenge to him or the other way around? If there are none that come to mind during his stint, then maybe anything Red Hood pre-Flashpoint?
Jason Todd's Definitive Rogue Gallery
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