Haven Bay is a background seapony from Seaquestria: curious, warm, and easygoing, she loves exploring the ocean floor. She’s often imagined as an “off-screen” helper who collects pretty shells and brings them to Princess Skystar. She appears only briefly, but stands out with a soft, oceanic vibe and a consistently positive mood.

Positive tags:

Haven_Bay — activator
merpony, seapony — boosters
green_necklace — green necklace on the neck; I added this because I’ve seen her with it in some sources (optional)
double_fin_wings — 2 wings/fins for the seapony
central_dorsal_fin — central dorsal fin on the body

Choose one (use 1 tag):

fin_ears_v1 — fin ears (most stable)
fin_ears_v2 — fin ears shaped like “shells”
fin_ears_v3 — fin ears from the original My Little Pony: The Movie (may be inaccurate / can glitch)

Mood boosters:

playful
smile / open_mouth_smile
friendly
cheerful
curious
attentive

Poses

Full body: full_body, swimming, dynamic_pose / s_pose
Head sticker: head_only, floating_head
From behind: from_behind, back_view
From above: from_above

Examples

1) Playful smile:
Haven_Bay, merpony, seapony, green_necklace, double_fin_wings, playful, smile, looking_at_viewer

2) Laughing:
Haven_Bay, merpony, seapony, green_necklace, double_fin_wings, happy, laughing, open_mouth, closed_eyes

3) Excited / delighted:
Haven_Bay, merpony, seapony, green_necklace, double_fin_wings, excited, cheerful, smile, wide_eyes