Derech Eretz Zuta (1:5) says that Eliezer, the servant of Avraham, was one of the people to have entered Gan Eden alive, while in Pirkei D'Rabbi Eliezer (16:14) we are told Eliezer is the same person as Og, the king of Bashan, who was a rasha. What is the consensus by most meforshim? Was he a tzaddik, worthy enough to enter Gan Eden alive, a privilege only granted to a few select tzaddikim, or was he a rasha?
In this medrash Talpiot written by Hamekubal Rav Eliyahu Hacohen of Izmir about 300 years ago he writes in entry "Eliezer" (the entries are written in alphabetical order) Eliezer did a kabalistic concept called "Pirud" which basically means separating the bad side of ones neshama into another body. The bad side became Og Melech Haboshon and the good side became Blessed (as Lavan said "בא ברוך ה') and he entered into Gan eiden alive.
He also brings the Zohar that says about Ester that she also did Pirud and the bad side of her neshama which was removed into another body had relations with Achashveirosh and had a son Darius which might explain why all the kings of Persia henceforth were not recorded as adherents of Judaism.
There were two Og's, kings of Bashan. One was Eliezer, the other was the famous rasha Og.
Source: Daas Zekeinim to Genesis 24:39
I don't know the rabbinic "consensus", but I can add a useful source to the discussion.
Chida in Shem Hagedolim (Maareches Hagedolim, Mar Rav Avraham Gaon) notes that Mabit (1:276) states that people who name after Eliezer must be naming after Eliezer the son of Moshe Rabbeinu, because Eliezer was cursed (with the assumption by Chida based on this being that he was a Rasha). However, Chida himself concludes that he was a Tzaddik and Chacham (even asking on the Mabit based on this conclusion). He bases his opinion on Yoma 21b (in comments) and the source quoted above that he entered Gan Eden alive.