Asking for clarification for a few things for... reasons (an artist's reasons!)— I hope you don't mind!
Pendragon colours are red and gold, right?
What's Lothia's colour? I get the feeling black's gotta be one of the colours of House Leudonus, what with Gareth's room being decked out in ebony, and bears definitely gotta be their signature animal (by the way, I love love love your description of Gareth's room: how it's full of bears but there definitely are hidden snakes, like how he's seen as Lot's but he takes after Morgana in many aspects, also gives the feeling he's a hidden trap in the shadows, poised to strike at the right moment. Very much cunning vibes, even if we haven't seen him be cunning and sly just yet— Y'know what I'd love to see? Merlin vs Gareth in a battle of wits, constantly plotting to undermine each other. I think Gareth could do it. He'd rival Merlin in being this puppet master in the shadows. Also love how Mordred now knows “where to look for [the snakes]” and my Mordred has a good relationship with their brother, does that quote still show up for Mordreds with bad relationships? If that's the case my headcanon/theory doesn't hold water but I like to think that that quote is a demonstration of how they know their brother inside and out, how they 100% trust and love each other, Gareth will never be the one to strike Mordred from the shadows [or ever, really] and Mordred will never hurt Gareth either. ANYWAYS THAT WAS A FUCKING RANT I'M SORRY)
If the Leudonus duo colours include black, and Pendragon colours red, I can imagine my Mordred wearing clothes that are red-and-black, a hint at their true lineage! The black is mostly there to honor Gareth, as eventually I imagine Gareth would become the only person they trust with their whole heart (Morgana is... complicated)
What are Le Fay colours? I can imagine Gareth having subtle features of Le Fay colours in his everyday attire, blended with the black of Leudonus.
I saw your other ask and no, I don't remember getting anything so tumblr must have eaten it - unless this is the original you sent? Anyway, on to the answer!
So yeah, the Pendragon ones are red and gold - though red alone is very much associated with them too, gold comes from their dragon on their emblem.
The Leudonus colors are dark green, (it's described a few times as moss green throughout chapter 4 tho that's only on Patreon/Kofi, and at least once in chapter 3 which is public - Accolon wears green armor when fighting Lancelot and I think it's mentioned as being Lothian colors, but this was a later edit I did to add more description so it's easy to miss). The brown bear is their symbol so it's more of a dark brown and green combo.
The Le Fay colors are blue and gold (the serpent). It's sort of a lighter blue, an azure shade.
And regarding Gareth - don't apologize, I always love hearing people's thoughts! Yeah, the quote differs depending on your relationship - if it's good, it's the one you mentioned; otherwise Mordred says they would have missed the snakes if Morgana didn't tell them she'd taken care to include the details. And oooh, Gareth interacting with Merlin is definitely something we will see but saying more is spoilery!
