Chara human daughter of asgore and toriel, has crush on asriel?
Frisk human Broke out the monsters from the underground and has a crush on monster kid
Monster Kid has a crush on frisk
Asgore ex of Toriel and father of chara, asriel 
Toriel mother of chara, asriel, has a crush on sans
Sans skeleton, lazy, punny, has a crush on Toriel, brother of papyrus
Gaster father of sans and papyrus, married to Arial, used to be in void
Papyrus/Mettaton has a crush on eachother
Herman (river person) is kind 