Seeking to get their love interest to react positively to their presence and to care about them, they manipulate their love interest's feelings and world perception. Some might see their love interest as incapable of caring about them. Others might think that their love interest wants to feel "in love" or "happy" around them so they try to address their emotional state so that they frequently feel "in love" or "happy."
A real difficulty for these yandere characters is balancing being overt, to help their love interest to intentionally care more about them, while also being suitably covert to work on their subconscious. They prey on their love interest's weaknesses while simultaneously building (in a non-manipulative way) on their strengths. They also protect their love interest's weaknesses, as their love interest's feelings are theirs and theirs alone.
Any games that they play with their love interests head are not to harm them, and never would be. Rather, they are always designed to have both themselves and their love interest come out as wedded winners.
Usually mixed with usodere, they will try to look perfect around the love interest using lies and manipulating the truth.
Although they are seen by many as, well, manipulative, they just want to be 100% certain that their love interest is totally devoted to them and only them. They would rather their love interest cut off their right arm than leave them.
If their love interest actually wants to spend more time feeling than thinking in the relationship, then such a yandere could be ideal for the love interest, as they will spur them on to feel more and more.
Shock trope:
Their only goal is for their love interest to do everything they want and for the love interest to stay and be loyal to them, and they will use manipulation, gaslighting and even direct threats against the love interest to accomplish so, using the own morals and weaknesses of the love interest against them so they are forced to choose what the yandere really wants of them.
Contrary to the love trope, they usually do not hide that they are the ones influencing the ways of thinking of the love interest, or they don't genuinely want the love interest to end up deciding on their own to truly want being with the yandere. If the love interest ends up not having another choice but to be with the yandere because not being with the yandere could cause more harm, is enough, even if the love interest is forced to do so and doesn't feel any kind of affection for the yandere.
If they're capable and have such abilities, they can even use mind manipulation or brainwashing so the love interest would "love" them in return, even if these feelings are fabricated by the yandere. They don't care if the feelings of the love interest are genuine or if this changes the personality of the love interest in the process and leave them as just blank husks. Their only objective is for the love interest to love and be loyal to them in any form possible.
The shock manipulative yandere type don't usually just stop with preying on their love interest's weaknesses, they pry apart their love interest's psyche from within. They think love is manipulation, and so they manipulate more and more. Soon, love no longer exists in the hearts of either one.