Buenas días (good morning) Buenas tarde (good day) Buenos noches (good evening) (I think, it's been a few years since my last Spanish class)
こんちわ - konchiwa (hey | Slang variant of こんにちは) (Possibly just internet slang? I'm not actually sure.) おっす - ossu (hey) (not often used, and I've personally only seen males using it)
That would be in proper speech but any time I've seen konchiwa used they use wa rather than ha Edit: This is just me assuming but its probably the difference between saying 'Hi' and 'Hai', it's all the same in a casual setting.
"Jerry please don't double post it's against the rules and it really upsets me" is how I normally say hello