What is God Like?

https://www.lds.org/media-library/video/2014-06-01-joseph-smiths-first-vision?lang=eng

We all wonder what God is like. Some think He is a spirit who dwells in our hearts. Some view Him as a great Santa who grants all their wishes, but what is He really like? One of the best ways to know, of course, is through people who have actually seen God. 

Do Members of The Church of Jesus Christ of Latter-day Saints Believe Jesus is the God of the Old Testament?

We believe in the original teachings of The Lord Jesus Christ which He taught when He set up His Church when He lived upon the earth. The is why we are called The Church of Jesus Christ of Latter-day Saints. We do not follow the opinions of men that eventually replaced some of the Lord's teachings.

We believe that Jesus Christ was the Jehovah of the Old Testament and it was He who said:
3 And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name JEHOVAH was I not known to them.  Exodus 6:3
and                             
26 . . . ... all flesh shall know that I the Lord am thy Saviour and thy Redeemer, the mighty One of Jacob.  Isaiah 49:26  https://www.lds.org/media-library/images/category/teachings-bible-images?lang=eng