the youtube comments about this are dark and full of terrors

acathea:

y’all why does it look like the cr crew doesnt like orion/tiberius? idk im just getting this vibe, whenever he talks they look at him weird??

Okay, so I’m not entirely sure how far along you are, so there are spoilers in this up until episode 27. I’m trying to be chronological. And neutral.

Right from the beginning, Tiberius always had a tendency towards solo adventures. The fact that he spent twenty minutes in the first episode casting spells at a house is a good example.
In and of itself, that’s not really a bad thing, it’s just the first in a long list of instances where he did that. The rest of der Underdark arc didn’t offer itself up to these excursions, so the problem didn’t become apparent until later on.
By episode 11, things get ugly. Without giving a proper reason, Tiberius refuses to join the rest in fighting K’Varn, something the other players and characters bring up frequently afterwards, without ever getting a satisfactory answer from him.
The solution here is that Orion looked up what Beholders do, especially what they can do in their layers, and was afraid Matt was trying to kill him specifically.
Looking up information your character shouldn’t know in-game and then acting upon it is what we call meta-gaming. In the traditional sense. Later in the series, the term meta-gaming as used by the community means “that half-elf did something I disagree with”
It doesn’t help that during the K’Varn fight, Tiberius’ turns take forever as Orion tries to have him have his own little sub-plot as a mindflayer revolution leader and do twenty things in one 6 second turn that are completely unrelated to the major combat going on.
The first climax of objectionable behavior that annoys the rest of the cast happens when Tiberius gets the second final blow on K’Varn and then goes “you all wouldn’t have survived if it wasn’t for me”.
The latter is just not nice, the former is what in some circles is referred to as kill-stealing. Not a thing in D&D, usually, but somewhat applicable here.
When Scanlan tries to ask Tiberius about why the fuck he abandoned them for the fight, Tiberius burns a spell slot to silence him rather than answer. A Spell-off ensues. Humerous on the whole, but considering how it was a legitimate question that was never answered, a very rude way to avoid this conversation.
Also poor table etiquette: Orion trying to trade items with Sam while Sam isn’t at the table to trade with him. Not malicious, I’m sure, but poor etiquette nonetheless.
Also poor etiquette: When Vex makes a nigh-impossible shot in episode 16 or 17, and manages to roll somewhere in the 30ies, rather than see if she can have that moment, Tiberius casts a spell to help. Not malicious, but seemed like spotlight stealing, especially when you look at Laura’s reaction during this.
More poor etiquette: When Percy is trying to have a moment during episode 14 or 15 when the Briarwoods are mentioned in the council, Tiberius randomly inserts himself into the scene. Again, to be helpful, and yet, maybe not the most appropriate thing to do.
Things get really ugly during the Trial of the Take episodes, where he becomes really stand-offish and downright mean. Quoth Keyleth: “Why are you being such a poopy-head?”
Something that also starts becoming suspicious: Orion may or may not (look into youtube comments or reddit threads here for the full arguments) fudge his dice rolls and resource management a little. Usually concerning Sorcery points; I think they mentioned somewhere that Matt houseruled that Sorcerers get a few more points than in the vanilla handbook, but the amount of points and spell slots Tibs burns during these episodes is… Impressive.
Which may or may not mean cheating.
He also very adamantly insists on long-resting during a pursuit mission because he has burned all his higher level spells. Technically a valid concern, but not when you’re chasing an enemy on the clock who is already aware that he is being followed and has means to escape.
And usually, not that big of a concern when you’re the team’s damage dealer. Unless of course you have looked up that Rakshasas are immune to spells under 6th level and don’t want your character to not be the most awesome in the fight.
“You can’t always get the guitar solo” – Liam, at some point around that time.
At that point, when you look at the statistics, Tiberius had also knocked a bunch of party members unconscious on several occasions by being too carefree with friendly fire
During these episodes, Tiberius’ turns still take a seriously long time because he doesn’t remember his spells, forgets how certain items work (like the one he made a point to trade Sam for twice. See the Maths with Tiberius bit) and has to be almost constantly corrected on these, dragging out combat even more, which is bound to annoy other players at some point.
“I realize what I’m doing and stop.” – Tiberius, frequently, after having been informed that he got it wrong, again.
It is after this that the Tiberius shopping extravaganzas start. Now shopping trips are always a bit tedious for some, like battles are for others.
I personally liked Lockheed and found him a delight in the later episodes of Tiberius’s presence, but you can tell that Orion worked very little with Matt in figuring out how a familiar should work for him, or how to train him. Working with your dungeon master on things is key.
Also when training Lockheed, Orion often rolled before telling Matt what he was trying to do, which falls somewhere into the sliding scale of cheating, meta-gaming or just plain bad etiquette.
He also tries to have the… Spinning dagger wheel glaive thing built during this, again without consulting Matt beforehand, so figuring it out takes additional screentime from other players while Orion does his solo thing.
Compare and contrast: If and how Percy’s inventions work is almost always talked out off-screen so no actual game time is spent on the really fiddly logistics and debating of rules.
Then when the group returns to Emon in episode 24 and the Briarwoods come up again, everyone goes to talk to Percy about his backstory and the plot, except for Tiberius. Tiberius goes off to have his teleportation circle adventure.
Which, don’t get me wrong, was hilarious and actually did benefit the party. It still showed that either the player or the character showed no interest in the plot or the other player characters’ backstory, which is plain and simple not the kind of game being played here.
Cut to episode 25. Before even knowing what they’re facing, Tiberius charges his decanter of endless water. Because someone has been hitting the monster manual again and found out about vampires being weak to running water.
Now whether or not Tiberius knew this about vampires would have had to have been rolled for. He’s a scholar, so maybe. The true problem is that except for Vax, no one at the time actually knew they were facing a vampire. This is, again, what is usually referred to as meta gaming.
When Tiberius is then rendered completely incapable of thought or speech, he doesn’t do the instinctual thing Matt tells him to do, basically, in protecting his friends. He runs off to find Allura, again chosing the preservation of his own character over the rest of the group. And acting in a way he wasn’t intellectually capable of at the time.
I’m not gonna go into old lady gate and the events of episode 26. Chalk that up to actual character role play. Though the character is a bit of an entitled asshole, so people getting annoyed with that is understandable.
It gets really bad during episode 27 though. First, he makes a vagule inappropriate and uncomfortable comment about getting a “half-chub” from Vex’s brilliance. Which, ah. Everyone at the table thought weird at the time, and is just really uncomfortable.
They gave him the opportunity to redact this. He refused and doubled down that Tiberius was turned on by Vex’s mind.
Creepy and poor etiquette. Compare and contrast way later in the story when someone is definitely also turned on by her brilliance, but simply praises how amazing she is, rather than describing a physical reaction his character has and as such distracting from the person he’s trying to praise here.
He then goes on the longest shopping extravaganza yet, trying several impossible things he hasn’t worked out with Mercer beforehand, getting upset when he is told no, trying anyway, getting more upset when it doesn’t work. This is, by the way, the actual point where Travis starts muttering “I’m gonna kill him.”
He then tries to call for an army to deal with Percy’s personal arc. An army he had no access to, he had not previously talked about with his DM, and that would have made him the hero of someone else’s character arc.

Orion is gone from the table after that episode. Now mind you, there were some behind the scenes, legal, and personal shenanigans going on that we weren’t privy to. They all seem to be on mostly good terms, but nowhere as close as they were before the split. Orion has recently come forward and confessed that not only was he going through chemotherapy during this time, he also had or has a drug problem and felt like he was “trapped in his own head” at the time. He especially laments not being close friends with Marisha anymore, which further hints that some shit must have gone down.

Regarding the meta gaming and spotlight sharing, aside comments in later games tell us that Matt did try to talk to Orion about these issues outside of the game, but Orion didn’t really take it to heart too much, from what we can see.

Oh, also, there was a dispute where Orion yelled at a fan for making a T-Shirt on Twitter. So badly that other actors chimed in on the fan’s behalf. All that stuff is going on during Orion’s last 10 or so episodes.

TL;DR: Orion was bad about sharing the spotlight during the game, worked against instead of with the DM, may or may not have cheated to make his character look cooler, all the while going through a few personal crises and facing some administrative issues behind the scenes. None of the things here were done with malicious intent, neither by Orion nor the other players. The playstyles just didn’t mesh, and the little things added up, creating the friction that is tangible during later episodes. And that’s why he gets these looks.