1. Good example: any character that was LGBT by design as conceived.
Bad example: any character that was changed into LGBT despite being straight originally. This is the disease plaguing entertainment today.
2. There shouldn't be a fucking quota. There shouldn't be a checkbox for developers to add an LGBT character just for the sake of diversity. It should be organic. If the situation calls for it, good. If you're just adding one for a checklist, fuck off.
3. Representation for the sake of representation is bullshit. Just like battlefield 5's forced inclusion of one armed women on the front lines of world war 2 just for the sake of inclusion at the expense of logic and accuracy, it's freaking stupid. Add characters if they make sense, not to fulfill a quota.