Although I think that you meant “friendly” when you used the word “palakaibigan”, that is not the right Filipino word to mean “amiable/cordial/genial” as one’s disposition or temperament. Actually, I don’t think we have a Filipino word for “friendly” in that sense. “Palakaibigan” means more like “gregarious” as it suggests active behaviors aimed at making friends with strangers. We can use “karinyoso” (from the Spanish “cariñoso (affectionate)” to mean “friendly disposition”, but it is an impression customarily based on face-to-face, or at least an oral, communication as body language and tone of voice would play a role in making that conclusion. It’s a long shot to base it merely on something written.
Similarly, “malaki ang mga salita” does not translate to the exact meaning of “big words” in English. Using “malaki” as an adjective for “salita” will not make sense as “malaki” suggests something that is measurable. “Mababaw (low level/basic)” can possibly convey what you meant. “Mababaw lang ang mga alam kong salita” translates to “I only know low-level/basic words”.
Nikki, Bubbles, Lovey at Lightning Boy ang mga pangalan ang alagang mga isda ko.
I guess what you wanted to say is: The names of my pet fishes are Nikki, Bubbles, Lovey, and Lightning Boy. However, your Tagalog/Filipino sentence appears to have 2 potential subjects, which are identified by the 2 “ang” that you used. Literally, your sentence translates to “Nikki, Bubbles, Lovey and Lightning Boy THE names THE pet my fishes”.
“The names the pet my fishes” should be “THE names OF my pet fishes” and in Tagalog that is “ANG mga pangalan NG mga alaga kong isda/mga isdang alaga ko”.
So, “The names of my pet fishes are Nikki, Bubbles, Lovey, and Lightning Boy”, which is in the active voice, becomes:
“Ang mga pangalan ng mga alaga kong isda/mga isdang alaga ko ay Nikki, Bubbles, Lovey, and Lightning Boy.”
Transposing that by placing the predicate ahead of the subject:
Nikki, Bubbles, Lovey, at Lightning Boy ANG mga pangalan NG mga alaga kong isda/mga isdang alaga ko. = The names of my pet fishes are Nikki, Bubbles, Lovey, and Lightning Boy.