Hi Lizeta :)
I'm not sure if there's a perfect translation into English for what you're looking for, but I have a couple of suggestions for ways to compliment someone's personality/character, without it coming across as 'flirtatious'.
"You're very easy to get along with" - This is a nice way of saying you like someone, without being suggestive.
"I enjoy hanging out with you" - Also a nice way to let someone know you like them, but don't necessarily "like them" like them.
Of course, anytime you compliment someone's personality, it might come across as more than just friendly. Other parts of your speech and mannerisms can help you drive home that your interest in them is purely as a friend.
Hope this helps!