While you might not have time to re-read/watch the entirety of their respective canons, re-reading/watching significant scenes involving your character(s) may help just as much. :) For example, on YouTube, there are plenty of videos of just specific scenes as opposed to entire episodes, even if it's just part of a fight scene or "LOL MY FAV SCENE WHERE SO-'N-SO FALLS DOWN".
If I may use a more personal example from my experience, Darc is one of the characters that I have a harder time with. He's moody, and nearly switches personalities at the drop of a hat (his "human side" and "Deimos side", and hell sometimes he's a little of both). There aren't many videos from his canon online (and most of which were uploaded by me in the first place), but even just watching those seems to help. Re-watching the ending cinematic reminded me that Darc can be kind of corny too. Plus there's also a game script uploaded to Game FAQs, and skimming through scenes involving him help me re-grasp his speech style, vocabulary, relationships, etc.
So uh, long story short, a little bit can go a long way. Bookmark your character's most significant and/or your favourite scenes in their book canons and just read through those. Or in the case of anime canon, look up the same sort of scenes involving them. If they have a theme song, listening to that can help too.
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If I may use a more personal example from my experience, Darc is one of the characters that I have a harder time with. He's moody, and nearly switches personalities at the drop of a hat (his "human side" and "Deimos side", and hell sometimes he's a little of both). There aren't many videos from his canon online (and most of which were uploaded by me in the first place), but even just watching those seems to help. Re-watching the ending cinematic reminded me that Darc can be kind of corny too. Plus there's also a game script uploaded to Game FAQs, and skimming through scenes involving him help me re-grasp his speech style, vocabulary, relationships, etc.
So uh, long story short, a little bit can go a long way. Bookmark your character's most significant and/or your favourite scenes in their book canons and just read through those. Or in the case of anime canon, look up the same sort of scenes involving them. If they have a theme song, listening to that can help too.
I hope all this helps! ♥