I got a few in mind.
1: Lan Hikari and Megaman EXE (Megaman Battle Network)
2: Izuku Midoriya (My Hero Academia)
3: Naruto Uzumaki (Naruto Shippuden)
4: Sora (Kingdom Hearts)

Gill Moss (Kim Possible)

I'd be more than excited to see more males.

Where do I even start?

1. Mas and Menos from Teen Titans
2. Baby Mario and Baby Luigi from Mario series
3. Toad from Mario Series
4. Timmy Turner from FairyOddParents

Ben Tennyson
link
buzz lightyear

Bino or King from Housepets

Beppi (Cuphead)
Djimmi (Cuphead)
The Noid (Dominos)
Mike Hatsune (Yo Noid 2)
Cosmo (Fairly OddParents)
Pleakley (Lilo and Stitch)

Fumekage Tokoyami from My Hero Academia is cool.
Morgana from Persona 5 is a bit androgynous, but he is adorable.

Phineas and Ferb (Phineas and Ferb)

Toad (Mario)
The Bears (We Bare Bears)
Grumpy Bear (Care Bears)
Tolee (Ni Hao, Kai-Lan)
Rubbbe (Paw Patrol)
Pocoyo (Pocoyo)
Clyde (Loud House)
Male White Mage (Final Fantasy)
Sly Cooper (Sly Cooper)
Roobear (Adventures of the Little Koala)

0. Christopher Thorndyke (Sonic-X)
1. Willykat & Willykit (Thundercats 2011)
2. Len Kagamine & Rin Kagamine (Vocaloid)
3. Tate & Liza (Pokemon Original Series)
4. Harry James Potter (Harry Potter and The Philosopher's Stone)
5. Anakin Skywalker (Star-Wars Episode-1)
6. Shobu Kirifuda (Duel Masters)
7. Mokuba Kaiba (Yu-Gi-Oh)
8. Mowgli (Disneys Cartoon, The Jungle Book)
9. King Arthur (Disneys The Sword In The Stone)
10. Ken Kitazawa (Powerpuff Girls Z)

I have a long list.

Fukase (Vocaloid)
Oliver (Vocaloid)
Dex (Vocaloid)
Alvin (The Chipmunks)
Simon (The Chipmunks)
Theodore (The Chipmunks)
Secret Squirrel (The Secret Squirrel Show; 1965)
Surly (The Nut Job)
Buddy (The Nut Job)
Hammy (Over The Hedge)
Nick Wilde (Zootopia)
Foxy (Merrie Melodies)
Yohioloid (Vocaloid)
Conker (Conker games)
Go Mifune/Speed Racer (Mach GoGoGo)
Sabu/Sparky (Mach GoGoGo)
Big Al (Vocaloid)
Tonio (Vocaloid)
Finnick (Zootopia)
Grayson (The Nut Job)
Mr. Feng (The Nut Job 2)
Chip and Dale (Disney)
Skippy Squirrel (Animaniacs)
Hamtaro (Hamtaro)
Sabu (Hamtaro)
The Rowdyruff Boys (The Powerpuff Girls)
Kaito (Vocaloid)
Leon (Vocaloid)
Cat Noir (Miraculous Ladybug)
Carapace (Miraculous Ladybug)
Kurio Mifune/Spritle Racer (Mach GoGoGo)
Jimmy (The Nut Job)
Johnny (The Nut Job)

Flash sentry

You REALLY gotta consider doing 9S from NieR: Automata. Or Gwyndolin from Dark Souls.

Definitely sora.

Hyrundrel Kuvaev, Lokhmaty (Masyanya short series)
Lider (CBAB PSAS)
ADULT!Kyle Broflovski and Stan Marsh (South Park)
Butch, Pietro, Phil (Animal Crossing)

Now that I think about it another good one would be Genie from Disney's Aladdin in his legs form (even though I've seen some ABDL art of other genies in tail form) since last time I checked there's no ABDL art of him at all (I'm into some weirdly designed characters)