(I wanted to add something since there are not many conversations or topics.)
personal answer (I do not hate any character, unless it's the intention ex: a 'villain'):
Jaime Reyes/Blue Beetle: This mainly stems from nostalgia from watching his Batman The Brave and The Bold version and back then I knew nothing about Blue Beetle. I loved seeing his YJ counterpart especially with his situation with the Scarab from the various mini conversations to seeing him become more confident in wielding it.
Bart Allen/Impulse, now Kid Flash: There almost no reason to dislike a friendly, humorous, hyper-energetic speedster. He finds everything in the relative present amazing. There's also his 'original' personality while in his original timeline I feel adds a hidden maturity/layer to his character. He's often seen as jovial and happy, but he's also come to appreciate his current present as it has what his past doesn't.