Which God/dessess?

The Aesir. Often enough he goes to blows with the gods of the Aesir, and sometimes the Vanir, (If you've read the Lokasenna, you'll know what I mean.) He really stays with the Rokkatru, as he is one of the Rokkatru. If Loki's your God, I recommend just staying with the Rokkatru, as to not offend.

Well, in my opinion, I don't think that is necessarilly true. Loki and Odin are blood brothers for one. Second, I do honor Thor and Odin as well and Loki has no problem with it

Heimdall and Loki are foretold to kill each other during Ragnarök, so I'm gonna say that he doesn't particularly like Heimdall.

That's rather...strange. I mean, Odin DID bind all of Loki's children away, Jormungandr to the seas, Fenrir in gleipnir, and Hel was sent to govern Helheim. And Loki caused the death of Baldr so...I can't imagine the two are on good terms. And Loki DID cause Thor's hammer to be short by taking the form of a fly and attacking Brokkr, so I imagine the same bad-blood between them.

Plus Loki and Odin were made blood brothers before Loki had did the events told in the Lokasenna, before he attacked Brokkr, Before he had Baldr slain. And, in Ragnarok, Loki fights against the Aesir...

Actually, Hex, while Loki does hold some resentment and bitterness- I've personally found in my own UPG that Odin and Loki are both respectful of each other due to their blood bond. He and Thor can be respectful of each other. Loki was often Thor's traveling companion and helped him many times. They are not eternally at odds because of what happened, in my opinion. They are Gods, and capable of more than holding a grudge for an eternity. He isn't incredibly fond of some of the other Aesir. Particularly the one Bree mentioned, as well as Skadi. He does tend to do better with the other Rokkr and Jotunfolk.

Interesting. I don't much work with the gods so I base my knowledge on what lore I gather. I'm more of a Nornist, so I can't say I know as much as someone who does work with the Gods.

Besides Skadi and Heimdall, what others are there?

Skadi, Heimdallr, Baldr, Frigg, and from my own personal experiences, Bragi and Idunn.

Idunn definitely makes sense.