What characters can be identified in the Obi-Wan Kenobi trailer?

Question

The official teaser trailer for upcoming Obi-Wan Kenobi series on Disney+ has been released and we are treated to some familiar faces and some new ones.

However, I suspect some of these characters that I think are new have been seen or mentioned in other Star Wars properties. So which ones can be identify using prior works?

To be concise I am asking about the following characters:

1. 
2. 
3. 
4. 

The others like Obi-wan himself, Owen Lars, young Luke, etc. I have worked out on my own (taps forehead).

May the Fourth be with you!

Answer 1

The first 3 are all Inquisitors, dark side individuals who hunted down the remaining Jedi after Order 66. We've mainly seen them in Star Wars Rebels and other content set at the same time such as the Star Wars Jedi: Fallen Order game.

The first one is the Grand Inquisitor, the highest ranking of them and the group's leader.

The third looks to probably be the Fifth Brother, at least that's what most places are reporting and he does look somewhat similar, costume-wise at least.

The second character here is the Third Sister but is also known as Reva. She is a new character for this series as far as I'm aware.

The fourth here is Haja Estree, he is a contact that Obi-Wan meets on Daiyu believing him to be a Jedi. In fact Haja is a con artist pretending to be a Jedi to trick people out of money.