For other views of Sahaba and a short description, see sahaba.
Shia do not have a ranking system dependent on when the Sahabi embraced Islam.
Rather, they have an individual view of each one, according to what they did during their life. In fact, a Sahaba who engaged in open warfare against the Ahl al-Bayt have their trustworthiness reduced to near nothing in the Shia view. Furthermore, Shia assume as self-evident that a sahabi that commits fasiq is going to hell. In fact, under the doctrine of Tabarra, it is obligatory for a Shi'a to disassociate from such a person.
Shias consider that any hadith where Muhammad is claimed to have, in one way or another, absolved all Sahaba from sin or elevated their trustworthiness is false. Shias claim that, in most cases, such hadiths have been reported by those who opposed the Ahl al-Bayt.
On the other hand, the Sahaba that are agreed to have sacrificed life and property for the sake of Muhammad are held in a very positive view, and under the doctrine of Tawalla, it is obligatory for a Shi'a to love such a person.
[66.10] Gsets forth an example to those who disbelieve: the wife of Nuh and the wife of Lut: they were both under two of Our righteous servants, but they acted treacherously towards them so they availed them naught against Allah, and it was said: Enter both the fire with those who enter.
Shias also support their view by citing the following verses addressing Muhammad's wives:
[33.30] O wives of the prophet! whoever of you commits an open indecency, the punishment shall be increased to her doubly; and this is easy to Allah.
[33.31] And whoever of you is obedient to Allah and His Apostle and does good, We will give to her her reward doubly, and We have prepared for her an honorable sustenance.
In other words, Shias view a wife of the prophet who "commits an open indecency" as being twice as blameworthy, because she was in the presence of God's best creation, Muhammad, and thus should have been inspired to act justly. Also, a wife who "is obedient to God and His Messenger and does good" is considered twice as admirable, because she received Muhammad's direct guidance and aided him and his Ahl al-Bayt.
[9.101] And from among those who are round about you of the dwellers of the desert there are hypocrites, and from among the people of Medina (also); they are stubborn in hypocrisy; you do not know them; We know them; We will chastise them twice then shall they be turned back to a grievous chastisement.
However there is a general consensus on an approximate view of each Sahaba, in the same way that most people would think very badly of Adolf Hitler and Ted Bundy and very well of Mahatma Gandhi and Jesus.
It would be impossible to establish a list showing the approximate view of each Sahaba for all the people in the world, since most people have very different frames of preference. However, it is much easier to do so if the targeted group have a similar frame of preference.
Most Shias have the same frame of preference regarding the relevant issues, since most disagreements between the Shi'as sects start after Husayn ibn Ali's era. This, and all sects being minority to the twelvers, explains why almost all Shi'a have a very similar frame of preference regarding the Sahaba, making this list relevant and accurate in the field of Social sciences rather than Hard science.
Shi'as can in general be expected to have a certain view on each Sahaba after having understood what relevant actions the specific Sahaba have accomplished during his or her life.
This is in contrast to Sunnis. Egyptian and Saudi Arabian have in general different views on, for example, Muawiya ibn Abu Sufyan, one more favorable and the other more dim, however, both are within the Sunni doctrines that claim the uprightness of all Sahaba and go to heaven.
The Ahl ul-Bayt are not included in this list, since the list revolves around them.
Ja'far ibn Abu Talib Ali's brother.
Harith ibn Abd al-Muttalib An uncle of Muhammad
Aminah bint Wahab was the mother of Muhammad and an aunt of Ali, she died before Muahmmad's call to Islam
Abdullah ibn Abbas was a staunch follower of Ali. Did not give allegiance to Abu Bakr, until Ali supposedly did so. Accompanied Ali when he demanded his inheritance from Umar and sought very badly of Umar and Abu Bakr. Convinced 20'000 of the 24'000 Khawarij to return to Ali.
Malik ibn Ashter was Ali's general when he came close to killing Muawiya, then became his governor, has long and beautiful letter addressed to him in Nahj ul-Balagha in which Ali gives guidance in how to uphold a government. That letter was referred to in the United Nations as an advice to Arabs.
Muhammad ibn Abu Bakr was Abu Bakr's son and a great companion of Ali. He was chosen to govern Egypt.
Khabbab ibn al-Aratt was a great role model in life.
Akib ibn Usaid was the first governor of Makkah.
Aqeel ibn Abi Talib a brother of Ali and cousin of Muhammad
Talib ibn Abi Talib a brother of Ali and cousin of Muhammad
Abbas ibn Abd al-Muttalib an uncle of Muhammad and Ali
Asma bint Umais a widow of Abu Bakr, who later married Ali
Lubaynah accepted Islam
Fazl ibn Abbas A cousin of Muhammad and Ali, he did not give allegiance to Abu Bakr, until Ali supposedly did so.
Khalid ibn Sa'id ibn al-As He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Buraida Aslami He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Ubai ibn Ka'b He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Khuzaima ibn Thabit Dhu'sh-Shahadatain He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Abu'l-Hathama Bin Tihan He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Sahl ibn Hunaif He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Uthman ibn Hunaif Dhu'sh-Shahadatain He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Abu Ayub Ansari He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Jabir Ibn Abdullah Ansari He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Hudhaifa ibn Yaman He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Sa'd ibn Ubaida He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Qais ibn Sa'd He did not give allegiance to Abu Bakr, until Ali supposedly did so.
Arwa bint Abd al-Muttalib was one of the meritorious women.
Zubayr ibn al-Awwam Fought against Ali in Battle of Jamal alongside Talha and Aishah bint Abu Bakr.
Abdullah ibn Zubayr argued with ibn Abbas for the legitimacy of the ban against temporary marriage, fought Yazid for the Caliphat.
Abd al-Rahman ibn Awf demanded that Ali was to follow the Quran, the way of Muhammad and also the way of Umar and Abu Bakr in order to be the third Caliph.
Um Ruman was Abu Bakr's wife
Anas ibn Malik was famous for his disillusionment towards Ali
Abdullah ibn Umar contradicted his father regarding temporary marriage and also other of his misunderstandings, did not give oath of allegiance to Ali,
Umar ibn al-Khattab Regarded as an unholy and ignorant usurper and illegitimate leader; see his main Wikipedia entry for partial further details of the Shia view (and the sharply contrasting Sunni view).
The list is divided in parts to make it easier to overview
Ibn Mandah's book "Those of the Companions Who Lived 120 years.":
They are fourteen: