Utsuho has neat resistances to Dream, Earth, and Fire- all of Steel's weaknesses- and a broad array of useful support moves, including Will-o-wisp, Twister, Whirlwind, and Roost. She's also one of the only puppets in the game with Fire Veil, enabling her to come in safely on Sakuya's World. Unfortunately, her bulkiest form has very underwhelming 70/70/70 defensive stats...normally, anyway.
DEFENSE UTSUHO
Fire/Flying
Ability: Blaze/Fire Veil
Stats: 100 HP, 60 Attack, 110 Defense, 115 Special Attack, 80 Special Defense, 75 Speed
Her highest stat is intentionally still Special Attack- this is Utsuho, after all. Special Defense suffers because it correlates with the Smart contest category and she isn't that bright. While the other Utsuho shard forms trade critical coverage moves for ungodly stats, this one is fairly tame, so I don't see it being terribly broken with access to all her useful status options (Will o' Wisp, Roost, Twister, Whirlwind). With regards to damaging attacks, this isn't meant to be a sweeper- Flamethrower/Fire Blast/Lava Plume, Energy Ball, and Solarbeam are the only useful attacking moves she needs. (SelfDestruct and Brave Bird do not count as useful with 60 Attack).
edit- in hindsight this looks a lot more like a tech form than a defense form