No, that's not correct. 「です」is mostly used at the end of a sentence (sometimes it can be in the middle, if it's part of a conjunction, like 「ですけど」 or something.
Most of the time you can't tell if someone is using polite speech until they're finished with what they're saying, because what makes it polite usually comes at the end of the sentence.
So, that being said, if you wanted to say 「優しいし、かっこいいし、面白いから」 in polite speech, it would be 「優しいし、かっこいいし、面白いですから」
No, that's not correct.
No, that's not correct. 「です」is mostly used at the end of a sentence (sometimes it can be in the middle, if it's part of a conjunction, like 「ですけど」 or something.
Most of the time you can't tell if someone is using polite speech until they're finished with what they're saying, because what makes it polite usually comes at the end of the sentence.
So, that being said, if you wanted to say 「優しいし、かっこいいし、面白いから」 in polite speech, it would be 「優しいし、かっこいいし、面白いですから」
I hope I helped. ^^