These are some character info
Chara
Gender:Female
Age:17
Asriel
Gender:Male
Age:18
Sans
Gender:Male
Age:18
Frisk
Gender:Female
Age:17
Papyrus
Gender:Male
Age:17
Mettaton
Gender:Female(Female in our AU)
Age:17
Undyne
Gender:Female(Maybe a little lesbian)
Age:18
Alphys
Gender:Female
Age:17
Flowey(They are different persons here but sometimes they are the same)
Gender:Male
Age:18(I can't think of anything)
Toriel
Gender:Female
Age:47
Asgore
Gender:Male
Age:50
Ps.Chara & Frisk are biological twins here(Chara is the oldest)