
Quick answer — Yukiko Horiguchi worked on K-ON!: The Movie (Character Design), K-ON! Season 2 (Character Design), K-ON! (Character Design) and 12 more anime.
Yukiko Horiguchi worked on K-ON!: The Movie (Character Design), K-ON! Season 2 (Character Design), K-ON! (Character Design), K-ON! Season 2: Plan! (Character Design), Tamako -love story- (Character Design), K-ON!: Live House! (Character Design), Kokoro Connect ~ The OVAs (Original Character Design), Lucky☆Star OVA (Character Design) and 7 more.