Theory:

Our love is everlasting,
I just wanted you to know.
That you're my special hero
and I wanted to tell you so.
Explanation:
 
The speaker declares that the love that the father and the daughter share is everlasting. She wants her father to know that there is no end to the love she has for him. The bond between a parent and a child is hard to break, and the love stays on.

Again, the everlasting love that the speaker was speaking about echoes several lines from "The Bible". For instance, Psalm \(136:26\) talks about how "his (God's) steadfast love endures forever". Moreover, Indian philosophy also compares the father to God. It says "Pitru Devo Bhava", which means Father is equal to God". The reason for such an idea could be simple: a father can love and protect his child like a God without expecting anything in return.
 
praying-31126_1280.png
A father can love and protect his child like a God

Finally, the speaker concludes the poem by reinforcing the poem’s central theme: father is indeed the speaker's special hero. No matter who comes into her life, her father would always be a hero in her eyes. She says she wanted her father to know how much admiration and love she has for him.
 
shutterstock_304417709.jpg
The daughter's special hero is her father
 
Meanings of difficult words:
 
S.No
Words
Meanings
1
EverlastingSomething that remains forever or for a very long time
2
SteadfastSomething that stays the same for a long time without changing quickly or unexpectedly
3
EndureTo continue to exist for a long time
4
ReinforceTo make an idea or belief stronger
Reference:
State Council of Educational Research and Training (2019). Term-3 English Standard-8. Special Hero - Christina M Kerschen (pp. 104). Published by the Tamil Nadu Textbook and Educational Services Corporation.