Ceil: he is jealous of Sebastian he thinks that Sebastian is so he thinks that you will fall in love with Sebastian but you tell him that you only love him and him only than he rubs it in Sebastian face.

Alois: he thinks that no one can suppress him in your love but he is jealous of your pet you have he thinks that the pet gets more affection than him.

Grell: he thinks that you feel sad that he like William a lot so he tells you that he loves you very much every day and that he does not want to lose you to anyone even William.

William:well people will think that he wouldn't be jealous of anything but you are wrong he is jealous of your work he thinks that you spend your time doing work than you spend your time with him.

Undertaker: honestly he's not jealous he's just not jealous I mean he spent his time dissecting bodies and stuff and so do you. You spend the whole time together y'all are together like basically the whole entire time so I don't know why he got to be jealous anyway.

Claude: he is very laid back and scary so no one dares to even talk to you when y'all are out together.

Triplets: ok let's be honest they're basically like I mean all of them are like basically jealous of each other I don't know why there just jealous but you spend even amount of time with each of them.

Pluto: he is jealous of Sebastian because you like to play with Sebastian and Sebastian likes to play with you to (ok man why are they all just jealous of sebby like what he do than being hot)