A translation done by anon on MLPG:
 
https://boards.4chan.org/mlp/thread/31779318#p31781433
 
小馬寶莉大電影 角色大揭秘  
“My Little Pony: The Movie” Roles Revealed
 
狂風指揮官  
Tempest Shadow  
狂風指揮官本是小馬利亞的獨角小馬,可是她失去魔法後,成為風暴王的心腹、副指揮和首席賞金獵人,負責跟蹤和捕獲紫悅和一眾小馬。只要完成這個任務就可以恢復她的魔法。  
鄭欣宜 聲演
 
Tempest Shadow used to be an Equestrian unicorn. But after losing her magic, she becomes the Storm King’s trusted assistant, second-in-command and chief bounty hunter—responsible for tracking and capturing Twilight Sparkle and her friends. Only by completing this task can she regain her magic.
 
Voiced by: Joyce Cheng (Zheng Xinyi)
 
精靈貓貓卡珀  
Capper  
卡珀原是一個貴族,在風暴王掌權後,他便成了一個伶牙利齒的騙子。一次錯誤的交易,令卡珀成為了身無分文的人,為了維持生計,他利用自己的智慧和魅力,到處詐騙他人。  
徐天佑 聲演
 
Capper was a noble. But under the Storm King’s rule, he became an eloquent swindler. One bad deal made Capper penniless. Now, in order to survive, he must rely on his wit and charm to swindle others.
 
Voiced by: Chui Tien-you (Xu Tianyou)
 
(typos in the image: 伶牙利齒 should probably be 伶牙俐齒)
 
風暴王  
The Storm King  
風暴王是小馬利亞以南的邪惡統治者。他在過去幾年間一直在擴張勢力,現在他瞄準了小馬利亞。他動不動就怒吼,發怒,而且有點瘋狂,利用手下風暴衛兵打敗敵人。
 
The Storm King is an evil ruler who reigns south of Equestria. For the past few years, he has expanded his power. Now, Equestria is his next target. He angers easily and is a little crazy, exploiting his Storm Guards to defeat the enemy.
 
黑風船長  
Captain Celaeno  
黑風船長曾經是傲慢但勇敢的探險者,但現在她和船員只能擔任風暴王的運輸工人。當她發現在船上的小馬時,小馬們令她記起自己曾經是多麼令人敬畏。最後,她和船員更幫助紫悅對抗風暴王。
 
Captain Celaeno was once an arrogant, yet brave explorer. Now, however, she and her crew only serve as the Storm King’s delivery service. But when she discovers ponies on her ship, they help remind her of how awesome she once was. In the end, she helps Twilight resist the Storm King.
 
天星公主  
Princess Skystar  
年輕的天星公主活潑好奇,但生活十分無聊,她只能與貝殼交朋友。天星公主很希望結識新的朋友以及展開冒險,是小馬們讓她發現新世界,而且她是幫助小馬的關鍵人物。
 
Young Princess Skystar is lively and curious, but her life is boring: the only friends she has are shells. She wants to make new friends and go on an adventure. The ponies help her discover a whole new world, and Skystar ends up being a pivotal ally for them.
 
諾娃女王  
Queen Novo  
天星公主的母親,曾經是鷹馬王國的女王,卻被風暴王侵佔,被迫逃亡,利用魔法把小馬們變身成海洋小馬。現在隱身於海洋深處,享受美好的生活,如章魚扎瑪的按摩。
 
Princess Skystar’s mother was once the queen of the hippogriffs. But when the Storm King invaded their home, the hippogriffs were forced to flee and use their magic to become seaponies. Now, hidden in the depths of the ocean, they live a fine life of octopus coral massages.

I tried my hand at some literal translations thanks to Google Translate and Wiktionary:
 
Tempest Shadow = 狂風指揮官 = literally, “crazy wind finger command official,” or fierce wind commander  
狂 = crazy, unruly  
風 = wind  
狂風 = gale  
指 = finger  
揮 = command  
官 = official  
指揮官 = commanding officer
 
Capper = 精靈貓貓卡珀 = elf cat capper (kǎ pò)  
精靈 = elf  
貓 = cat  
卡 = to get stuck  
珀 = amber
 
Storm King = 風暴王 = storm king  
風 = wind  
暴 = cruel or violent  
風暴 = windstorm, tempest  
王 = king
 
Captain Celaeno = 黑風船長 = black wind captain  
黑 = black  
風 = wind  
船 = ship  
長 = long (as in length)  
船長 = captain
 
Princess Skystar = 天星公主 = sky star princess  
天 = sky or day  
星 = star  
公 = public  
主 = master or lord  
公主 = princess
 
Queen Novo = 諾娃女王 = promise girl (nuò wá) queen  
諾 = promise  
娃 = girl  
女 = female  
王 = king

I had wanted to send this to my friend…

Finally a full body version of that frontal Skystar image!!