Kaltren can be played as either a male or female, but has a male player. He defaults to male when a partner or artist doesn't express a preference.
Note that this is the same person who played Kal ~8 years ago, see Kal's description if you care about that sort of thing!
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Kaltren is a bipedal white rabbit, standing 5'8" tall, or about 173 cm. He's rather slender, sporting longish, dark brown hair on the reddish side. He's often seen smiling, a cheerful glint in his green eyes, behind a pair of lightweight half-rim glasses. Under that cheer tends to be a hint of nervousness and bashfulness, his long bunny ears usually at the midpoint between fully perked and lying back over his shoulders. He doesn't have too much muscle to speak of, and even if he was wiry, the muscle would mostly be hidden under his clothes.
His outfit of choice leads with a long-sleeved, dark red button-up shirt, the fabric treated in such a way that it has a black gradient when viewed from the side. This creates some interesting color play where the fabric wrinkles and folds. The shirt is left unbuttoned, and under it is a wine-red T-shirt, worn relatively tightly. His jeans are dark enough that they'd seem black at first glance, only the slightest hint of blue seen in the fabric. This is even more muddled by the pale yellow where the jeans are pre-faded, and he has a button in back to let his fluffy, teardrop-shaped tail poke through. Those pants are held up by a broad belt, comprised of a simple leather band and a solid rectangular buckle. On his feet are a pair of simple wooden sandals, worn less for style and more for function.
When he enters the Tub, he's usually looking around a bit, seeing if he sees anyone he knows. He tends to be a little fidgety and hesitant, and if he doesn't see anyone he knows, he tends to move toward a decently empty place to sit or lean, then spends most of his time people-watching or checking his phone. He's almost always willing to get into a conversation, though, even if he's not so great at driving it.
(Female description, as well as preferences, in the F-list link below! Nutshell description of preferences: Submissive, likes males and intersex characters, and really, really likes using his/her mouth.)
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Misc. Additions
Kaltren received a gift from Mimi of a red talisman with various kanji written in the overall shape of a rabbit. It is said this talisman increases leg strength greatly, though its intended use may be more embarrassing than the rabbit would like to admit.
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Misc. References
F-List link
FurAffinity link