Ego is the first person singular nominative pronoun. The first person plural nominative is nōs. Thankfully, the declensions of these personal pronouns are similar enough to the other declensions, see here: Latin Declensions.
Singular
Plural
Nom.
ego
nōs
Gen.
meī
nostrum/nostrī
Dat.
mihi
nōbīs
Acc.
mē
nōs
Abl.
mē
nōbis
Tū
Similar to Ego, Tū is the second person singular nominative pronoun, while vōs is the plural.
Singular
Plural
Nom.
tū
vōs
Gen.
tuī
vestrum/vestrī
Dat.
tibi
vōbīs
Acc.
tē
vōs
Abl.
tē
vōbis
Is, Ea, Id
Is, Ea, Id are the third person pronouns in the male, female and the neuter respectively. Unlike, ego and tū, we use the genitive of Is, Ea, Id to show possesion; for ego and tū, we use the possessive adjectives. Finally, the demonstrative Īdem, eadem, and idem, meaning the same, are formed by adding -dem to the endings below.