I think it's supposed to indicate a wavering intonation to indicate emotion, at least in Japanese. Not so sure it's all that well accepted in English though.
The ~ indicates indefinite length of the syllable. It it's like instead of writing "Jiiiiiiiiiiiii" you write "Jii~". Not used in "real" japanese afaik. Only in web slang and manga.
StaaareStaaareSweetsSocksFight!Ah, whoops...King BehemothUffunStarrre\Atai/\Atai/One of us!Hey!Not yet!Please adopt me1. Flan
2. Remi
3. PachePeople you know!Good friendBlack Cat of DarknessI had *Conk*Swiiing, SwiiingChenPant Pant↑Various crazy thingsFluffFluffStarrrePound PoundHuhhh?Kouma
(SDM)Dragon The star on Meiling's hata bad dream.....I'm lost...Are you ready yet?I - will - pun - ish - you!♡ Part of Sailor Moon's catchphraseWhere are youuーHellooo!Papaaa! Look, loook!Uuu—Patchouliii!!BonkHelloーSkitter SkitterCheeeeen!!We match!Is that so...?I've been entangled...SplassshYou can't tell who's who, you say?Utsubushi Kasane artistDaicon RadishOne of us!Lying Rabbit
(Uso Usa) How unfortunate~Pas camerade! Paaas au pas-pas!"March, comrade! Maarch, march-march!" Snippet from the French children's song "J'ai perdu le do de ma clarinette" ("I Lost the C of My Clarinet"). This line was kept in French in the Japanese translation of the song, so many Japanese kids grew up wondering what it meant.Game's fun! lol
