Responses
I might be wrong, but the first one sounds like Gokurakugai pre-serialization?
One-shot version: https://www.mangago.zone/read-manga/gokurakugai_sanbandori_no_ken/
Serialised version: https://www.mangago.zone/read-manga/gokurakugai/
No clue about the second one though, sorry!
Yes it's this one thank you!
1) Maybe the story was successful and was extended, but when I read it it was only a oneshot
There was a woman, I think she had a gun and a guy
I don't know if he could turn into a tiger or if one of them had tattoos but it was about tigers at one point lol
So they took jobs for money, unless they were detectives?
And that leads them onto the trail of traffickers, in this case the traffickers had kidnapped mermaids, and so they were helping one of the mermaid children find his family
This is a ridiculous explanation but I'm sure I'm mixing it up with another story, I'm afraid to give details of the other one
2) the second one was definitely a oneshot
About a girl, who was an assassin and had these long guns to aim far
Except one day she comes across a bigger fish than her, like there was the image where he looks in the viewfinder and all that stuff
So she tries again and again but she can't kill him and that amuses the guy
I forgot the why and how, but she was kidnapped, I don't know by whom ( not sure about this... )
And the guy, who is actually his brother, comes to help her
Their father was killed long before, he was either a mechanic or a scientist
The brother had a lot of robotic implants
Thanks to those who can decipher this, I'm not even sure I read them here