well lets see
hiromu/tim:similiar in attitude; if you've read the new 52 books and the pre-52 books while being red robin he became more blunt and straight forward as i see with hiromu(plus both of them are the best out of their groups:thumbs
ryuuji/dick: both are the eldest of their groups, I find both t o be more easy to work with, and both have surperior fighting techniques
yoko/stephanie: i think both are have some level of immaturity and stubborness, but are exceptional fighters
commander horuki/batman: need I really say why they're similar( we all know how batman is),but if you've watched young justice,justice league unltimited epilouge, justice league:doom or read anything about his peronality then you'll see why, i'll give u a head start rewatch gobusters ep4
morishita/alfred: both are more closer to the commander/batman, he hasnt had any real character developing speaking roles but he seem mild mannered enough like alfred
nakamura/barabra gordon: again no real character development to compare personallites but they're both computer experts
enter/joker: I suppose my best comparison is that they both do funny things
messiah/the brain and brainiac: messiah sound like the teen titans adaptaion of the brain and messiah has brainia powers but also has a one track mind like brainiac only wanting knowledge of all planets and superman turned into data messiah only wants enertron and the gobusters
hope that helps