He's not my fave character but I don't think he deserves all that hate... I think he was just created to guide the new/returning blueberries through the New Light quest [i](and also being a key character for Gjallarhorn quest)[/i], I don't see anything bad on that.
Probably we haven't seen the true potential of Shaw Han as character yet.
But well, where is the hate coming from?
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Because it’s the same voice actor as Shiro-4, so it just should have been Shiro-4. No idea why they just made some bland, boring character instead of bringing back of everyone favorite bladedancer from rise of iron.