it really depends on the game being advertised, but to specifically attract me, the ad should present either the core game idea or the setting in a concise manner. long ads are not effective even in video format; it is often a mistake made by advertisers.
do not know at the moment.
there is no such ad.
the only times i've ever been interested in playing games i wasn't previously interested in have been when i've seen youtubers or streamers i enjoy play those games. in general, i dislike ads and prefer to take the recommendations of friends or content creators i trust over anything sponsored.
none
maybe something very colorful.
ads don't generally interest me, but if it features a story-based advertisement, possibly with a twist, and of course good-looking visuals from the game, then it might catch my interest.