Two WindClan guys.
Webfoot was Mudclaw's better apprentice, he appeared in Fire and Ice as an apprentice, and he mouthed off to Fireheart, and Fireheart was like,
"You've been living in sewers, does that make you a rat?" or something like that.
Then, after he became a warrior, he kept making snide comments about Crowfeather x Leafpool, like Crowfeather mentioned something about ThunderClan being able to hunt in trees, or something like that, and Webfoot was like,
"You would know."
and before Leafpool x Crowfeather happened, he noticed him looking at Leafpool and was like,
"Aren't there any WindClan she-cats for you to pad after?"
Weaselfur first appeared as an apprentice in the second series, but he got his chance to shine in Crowfeather's Trial.
He was one of the anti-Breezepelt cats, but after getting punished by Onestar, and forced to go look for stoats with Heathertail and Breezepelt, he changed his tune.
Then, he disappeared out of thin air.