Pogoda, Lady of the Seasons is a custom champion in League of Legends.
Pogoda (more about background and appearence below the skillset) is meant to be a versatile support mage that can help her team shape the flow of the game by adjusting her skillset. Unlike other transformation champions her ultimate has a fairly long cooldown and is channeled. Breaking the channel early results in diminished effect of the ultimate.
Pogoda starts in the Spring Form, suitable for both solo and duo laning. After reaching level 6 she can access her ultimate which transforms her into the next season. All spells share similar traits - Q is a single-targeted spell with 650 range, W is a support spell/aura, E is a targeted AoE utility spell with diameter of 700 and R is global, with 2 second channel and 2 seconds of effect after a full channel.
Despite already being quite restricted in skillset switching, some of Pogoda's spells don't deal damage or don't scale with AP. To balance that in an AP build her passive grants her on-hit magic damage, letting her make use of her own crowd control to deal some damage. AS builds shouldn't be too strong, though, since her range and base Attack Speed aren't that high. Building mana can be beneficient for some spells as well.
Pogoda is the Slavic goddess of the weather, nowadays it's the Polish word for the aura. Her design is quite simple - unlike badass-angry women we've seen in the League for the last year, she's meant to look peaceful and innocent. Simple dress, no cleavage (maybe in the summer form). Barefoot, no wand. Wears wreath that corresponds to the season.
Spring looks like a 15-year-old girl in a green dress. She has freckles, possibly red hair and she wears flower wreath on her head. Her voice is full of life, much like Lux. Summer wears a fiery red dress and wheatears in her blonde hair. She looks about 25-30. Her voice is deeper, much less naive and much more flirty. Autumn has some wrinkles, she's around 40-50. Yellow dress, black hair, red leaves in her hair. She's the most grumpy and annoyed one. Winter is an old, gray-haired lady in a blue dress and a holly wreath.
If the aging thing is too difficult to make or to confusing to play with, it can be simply a color pattern change, although it should be possible to do it with just textures. Voiceover would be probably the biggest part.
Strategy and Teamwork
Spring form suits Pogoda for the support role, with reliable root, AoE slow and a shield. Later in the game it's the form that allows to protect the carry in extended fights by peeling with root and slow. Summer form is the pushing stance and although using Summer Fever is quite mana-intensive it's generally the burstiest kit with built-in finishing mechanism on Overheat. It has no crowd control, though. Autumn transformation is probably the most powerful one due to the AoE stun, but the damage of this form is not as bursty and rather prolonged over time. Winter is the second most defensive form with powerful anti-burst spellshield that can make enemy spellcasts backfire. If Equinox isn't on cooldown, it has also a built-in revive, making you the last one to get focused (hence why pretty much nonexistent AP scalings in that form).
Generally Pogoda utilizes AP and support items in all of her forms, but it's possible to build her as a mana tank for more sustained AoE damage on Summer Fever or even on-hit with Nashor's Tooth for more sustained single-target damage.