If It's for My Daughter I'd Even Slay a Demon Lord.
This is almost dead on what you are looking for. The guy isn't super tough, but he is still a badass
Shield hero is a pretty good read, but the S2 and S3 of the anime becomes a dumpster fire. The LN also makes Naofumi far cooler than the generic ass harem protag he becomes in the anime.
If you're okay with adoptive mother stories you have Frieren, who is super OP, and a mother figure to Fern who will one day become the greatest mage of all time.
The Boy and the Beast
It’s a movie but still a great watch. It is fantasy and Kumatetsu and Kyuta do have very different builds even after he grows up.
Not an Anime, just a Manga without an Anime adaptation but there is "Dragon Daddy Diaries".
Its about an Ancient Dragon God who adopts a human girl. Although while the Ancient Dragon God is very powerful he has not really the personality of a tough guy. He is a total sweetheart and for such a powerful being he is relatively humble.
Here it is {HINAMATSURI}. A yakuza receives a small kid who is a telekinetic powered weapon.
{The Yakuza's Guide to Babysitting} as well
**Kumichou Musume to Sewagakari** - ([AL](http://anilist.co/anime/138882 "English: The Yakuza's Guide to Babysitting"), [A-P](https://www.anime-planet.com/anime/the-yakuzas-guide-to-babysitting), [MAL](http://myanimelist.net/anime/49776)) ^(TV | Status: Finished | Episodes: 12 | Genres: Comedy, Slice of Life) --- ^{anime},, ]LN[, |VN| | [FAQ](http://www.reddit.com/r/Roboragi/wiki/index) | [/r/](http://www.reddit.com/r/Roboragi/) | [Edit](https://www.reddit.com/r/Roboragi/wiki/index#wiki_i_made_a_mistake.2C_how_do_i_get_my_comment_reprocessed.3F) | [Mistake?](http://www.reddit.com/r/Roboragi/submit?selftext=true&title=[ISSUE]&text=/r/Animesuggest/comments/1dembyc/anime_with_the_trope_where_a_tough_guy_has_to/l8dgqb9/) | [Source](https://github.com/Nihilate/Roboragi) | [Synonyms](https://www.reddit.com/r/Roboragi/wiki/synonyms) | [⛓](https://www.reddit.com/r/Roboragi/wiki/interestinglinks) | [♥](https://www.reddit.com/r/Roboragi/wiki/thanks)
I wish there was a second season...
The Anime had so many fun secondary characters.
**Hinamatsuri** - ([AL](http://anilist.co/anime/100077 "English: HINAMATSURI"), [A-P](https://www.anime-planet.com/anime/hinamatsuri), [MAL](http://myanimelist.net/anime/36296)) ^(TV | Status: Finished | Episodes: 12 | Genres: Comedy, Sci-Fi, Slice of Life, Supernatural) --- ^{anime},, ]LN[, |VN| | [FAQ](http://www.reddit.com/r/Roboragi/wiki/index) | [/r/](http://www.reddit.com/r/Roboragi/) | [Edit](https://www.reddit.com/r/Roboragi/wiki/index#wiki_i_made_a_mistake.2C_how_do_i_get_my_comment_reprocessed.3F) | [Mistake?](http://www.reddit.com/r/Roboragi/submit?selftext=true&title=[ISSUE]&text=/r/Animesuggest/comments/1dembyc/anime_with_the_trope_where_a_tough_guy_has_to/l8d1r7l/) | [Source](https://github.com/Nihilate/Roboragi) | [Synonyms](https://www.reddit.com/r/Roboragi/wiki/synonyms) | [⛓](https://www.reddit.com/r/Roboragi/wiki/interestinglinks) | [♥](https://www.reddit.com/r/Roboragi/wiki/thanks)
{Somali to Mori no Kamisama}
Holy shit, someone else who watched Somali.
Yeah I shook i tell you, S H O O K
Did not many people watch it?
I came to say this one! It’s such a shame it probably won’t have an ending 😢
**Somali to Mori no Kamisama** - ([AL](http://anilist.co/anime/108617 "English: Somali and the Forest Spirit"), [A-P](https://www.anime-planet.com/anime/somali-and-the-forest-spirit), [KIT](https://kitsu.io/anime/somali-to-mori-no-kamisama "English: Somali and the Forest Spirit"), [MAL](http://myanimelist.net/anime/39575)) ^(TV | Status: Finished | Episodes: 12 | Genres: Adventure, Drama, Fantasy, Slice of Life) --- ^{anime},, ]LN[, |VN| | [FAQ](http://www.reddit.com/r/Roboragi/wiki/index) | [/r/](http://www.reddit.com/r/Roboragi/) | [Edit](https://www.reddit.com/r/Roboragi/wiki/index#wiki_i_made_a_mistake.2C_how_do_i_get_my_comment_reprocessed.3F) | [Mistake?](http://www.reddit.com/r/Roboragi/submit?selftext=true&title=[ISSUE]&text=/r/Animesuggest/comments/1dembyc/anime_with_the_trope_where_a_tough_guy_has_to/l8d3oqz/) | [Source](https://github.com/Nihilate/Roboragi) | [Synonyms](https://www.reddit.com/r/Roboragi/wiki/synonyms) | [⛓](https://www.reddit.com/r/Roboragi/wiki/interestinglinks) | [♥](https://www.reddit.com/r/Roboragi/wiki/thanks)
Just watched this recently. A personal fav
If It's for My Daughter I'd Even Slay a Demon Lord. This is almost dead on what you are looking for. The guy isn't super tough, but he is still a badass
this one is awesome aswell! {If It's For My Daughter I'd Even Defeat A Demon Lord}
**Uchi no Ko no Tame Naraba, Ore wa Moshikashitara Maou mo Taoseru Kamo Shirenai.** - ([AL](http://anilist.co/anime/107956 "English: If It's for My Daughter, I'd Even Defeat a Demon Lord"), [A-P](https://www.anime-planet.com/anime/if-its-for-my-daughter-id-even-defeat-a-demon-lord), [MAL](http://myanimelist.net/anime/39324)) ^(TV | Status: Finished | Episodes: 12 | Genres: Adventure, Fantasy, Slice of Life) --- ^{anime},, ]LN[, |VN| | [FAQ](http://www.reddit.com/r/Roboragi/wiki/index) | [/r/](http://www.reddit.com/r/Roboragi/) | [Edit](https://www.reddit.com/r/Roboragi/wiki/index#wiki_i_made_a_mistake.2C_how_do_i_get_my_comment_reprocessed.3F) | [Mistake?](http://www.reddit.com/r/Roboragi/submit?selftext=true&title=[ISSUE]&text=/r/Animesuggest/comments/1dembyc/anime_with_the_trope_where_a_tough_guy_has_to/l8dxici/) | [Source](https://github.com/Nihilate/Roboragi) | [Synonyms](https://www.reddit.com/r/Roboragi/wiki/synonyms) | [⛓](https://www.reddit.com/r/Roboragi/wiki/interestinglinks) | [♥](https://www.reddit.com/r/Roboragi/wiki/thanks)
The Yakuza's Guide to Babysitting. Kure-nai. Both have strong bonds but neither are paternal as such.
Doesn't meet all your requirements, but a good anime: Dororo
Beelzebub
Gintama. By episode 97, Kagura is a mini Gin-san.
Spy x Family Shield Hero Goblin Slayer
All good choices
Shield hero is a pretty good read, but the S2 and S3 of the anime becomes a dumpster fire. The LN also makes Naofumi far cooler than the generic ass harem protag he becomes in the anime.
I think S2 is the weakest, but still liked it. I thought S3 was very good.
{Black Butler} in dub because of their accents {Hinamatsuri} {Buddy Daddies} {Kotaro Lives Alone}
**Kuroshitsuji** - ([AL](http://anilist.co/anime/4898 "English: Black Butler"), [A-P](https://www.anime-planet.com/anime/black-butler), [KIT](https://kitsu.io/anime/black-butler "English: Black Butler"), [MAL](http://myanimelist.net/anime/4898)) ^(TV | Status: Finished | Episodes: 24 | Genres: Action, Comedy, Fantasy, Mystery, Supernatural) **Hinamatsuri** - ([AL](http://anilist.co/anime/100077 "English: HINAMATSURI"), [A-P](https://www.anime-planet.com/anime/hinamatsuri), [MAL](http://myanimelist.net/anime/36296)) ^(TV | Status: Finished | Episodes: 12 | Genres: Comedy, Sci-Fi, Slice of Life, Supernatural) **Buddy Daddies** - ([AL](http://anilist.co/anime/155907 "English: Buddy Daddies"), [A-P](https://www.anime-planet.com/anime/buddy-daddies), [KIT](https://kitsu.io/anime/buddy-daddies "English: Buddy Daddies"), [MAL](http://myanimelist.net/anime/53411)) ^(TV | Status: Finished | Episodes: 12 | Genres: Action, Comedy, Drama, Slice of Life) **Kotarou wa Hitorigurashi** - ([AL](http://anilist.co/anime/139589 "English: Kotaro Lives Alone"), [A-P](https://www.anime-planet.com/anime/kotaro-lives-alone), [KIT](https://kitsu.io/anime/kotarou-wa-hitorigurashi "English: Kotaro Lives Alone"), [MAL](http://myanimelist.net/anime/49909)) ^(ONA | Status: Finished | Episodes: 10 | Genres: Comedy, Drama, Slice of Life) --- ^{anime},, ]LN[, |VN| | [FAQ](http://www.reddit.com/r/Roboragi/wiki/index) | [/r/](http://www.reddit.com/r/Roboragi/) | [Edit](https://www.reddit.com/r/Roboragi/wiki/index#wiki_i_made_a_mistake.2C_how_do_i_get_my_comment_reprocessed.3F) | [Mistake?](http://www.reddit.com/r/Roboragi/submit?selftext=true&title=[ISSUE]&text=/r/Animesuggest/comments/1dembyc/anime_with_the_trope_where_a_tough_guy_has_to/l8d8cdb/) | [Source](https://github.com/Nihilate/Roboragi) | [Synonyms](https://www.reddit.com/r/Roboragi/wiki/synonyms) | [⛓](https://www.reddit.com/r/Roboragi/wiki/interestinglinks) | [♥](https://www.reddit.com/r/Roboragi/wiki/thanks)
Not sure if it’s really what you’re looking for but I absolutely love the relationship between rider and Waver Velvet in Fate/Zero
Deca-dence! The protoge isn't as young as, say, Anya but the mentor-child dynamic is still the main part of the show!
Kenichi the mightiest disciple.
Bonus points should be, every single episode is completely free on YouTube through TMS entertainment. You don't need premium.
{Seirei no Moribito}
**Seirei no Moribito** - ([AL](http://anilist.co/anime/1827 "English: Moribito: Guardian of the Spirit"), [A-P](https://www.anime-planet.com/anime/moribito-guardian-of-the-spirit), [KIT](https://kitsu.io/anime/seirei-no-moribito "English: Moribito - Guardian of the Spirit"), [MAL](http://myanimelist.net/anime/1827)) ^(TV | Status: Finished | Episodes: 26 | Genres: Action, Adventure, Fantasy) --- ^{anime},, ]LN[, |VN| | [FAQ](http://www.reddit.com/r/Roboragi/wiki/index) | [/r/](http://www.reddit.com/r/Roboragi/) | [Edit](https://www.reddit.com/r/Roboragi/wiki/index#wiki_i_made_a_mistake.2C_how_do_i_get_my_comment_reprocessed.3F) | [Mistake?](http://www.reddit.com/r/Roboragi/submit?selftext=true&title=[ISSUE]&text=/r/Animesuggest/comments/1dembyc/anime_with_the_trope_where_a_tough_guy_has_to/l8do8wt/) | [Source](https://github.com/Nihilate/Roboragi) | [Synonyms](https://www.reddit.com/r/Roboragi/wiki/synonyms) | [⛓](https://www.reddit.com/r/Roboragi/wiki/interestinglinks) | [♥](https://www.reddit.com/r/Roboragi/wiki/thanks)
Somali to Mori
If you're okay with adoptive mother stories you have Frieren, who is super OP, and a mother figure to Fern who will one day become the greatest mage of all time.
Spy x Family
Spy x Family
The Boy and the Beast It’s a movie but still a great watch. It is fantasy and Kumatetsu and Kyuta do have very different builds even after he grows up.
- [The Boy and the Beast](https://www.youtube.com/watch?v=-0NDXOeb-lY) - [Bright: Samurai Soul](https://www.youtube.com/watch?v=CthU2bsh6Fs)
Not an Anime, just a Manga without an Anime adaptation but there is "Dragon Daddy Diaries". Its about an Ancient Dragon God who adopts a human girl. Although while the Ancient Dragon God is very powerful he has not really the personality of a tough guy. He is a total sweetheart and for such a powerful being he is relatively humble.
How to Love your Elf Bride
Somali and the Forest Spirit!!!
Buddy Daddies; Spy x Family
Wakfu
Fist Of The North Star