He's extremely similar to Astarion in his way of using us...
Could you elaborate? I'm not seeing what you're referring to or meaning.
This is the first red flag. The second is that he's a bit too easy to farm approval with. It appears insincere. You may find yourself asking: What boxes of yours am I ticking, Gale?
This is one I've seen others say as well, and I don't get it - it's like they've decided in advance that these individuals are deceptive nasty pieces of work, so anyone who doesn't seem to be is automatically insincere... what, exactly, can you give me some examples, seems insincere about Gale's behaviour? What things does he do or say that 'seem' false?
It's pretty simple: Gale is a genuinely good person, who has made some bad decisions based on poor emotional choices, and backed up by enough knowledge and power to believe he had more capability than he did. That willingness of his to take personal risks for the sake of extravagant gestures and power moves may recur and may be a problem, but there's nothing deceptive about it. He doesn't share all of his problems off the bat - but he does so far sooner and more easily that Shadow does hers, and he rebuffs your early questioning before he's ready to a lot more politely than she does.
Gale approves when you choose to act in a way that is 'right' and 'good', but disapproves if you make promises that your circumstances may not allow you to keep. He approves of helping those in need, but disapproves of doing so in ways that will endanger even more people. He disapproves of sacrificing innocents for personal gain, but approves of aggressive actions against beings who are actively doing harm, or plotting to, even if it's a bit dangerous - as long as we're the only ones being put at risk.
Gale's a pretty open book, as far as his approvals go, arguably more so than most of the others.
(By the by, it's not a glitch that everyone knows everything whether they're in the party or not - seems to be a feature, that gets hand-waved as 'tadpole', even though we don't get to know everything they're doing in the same way.)
Like, it's always these nebulous statements of "He seemed insincere, because he was too friendly" and similar comments - but what are some non-nebulous examples, and what would have been the 'right' move instead, to convey a good, but overconfident character, in those cases?
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Konmehn.... I'm really not sure what you're talking about or why; what you're saying has, quite literally, nothing to do with anything being discussed in this thread.